diff --git a/.test_e2e.sh b/.test_e2e.sh
new file mode 100644
index 0000000..2f82c58
--- /dev/null
+++ b/.test_e2e.sh
@@ -0,0 +1,95 @@
+#!/bin/bash
+# M2.1 端到端测试 — 文字对话管线 (LLM → TTS)
+set -e
+cd ~/Showen/ShowenV2
+
+echo "=== M2.1 端到端测试: 文字对话 ==="
+
+# 停生产服务
+systemctl --user stop showen_v2.service
+sleep 1
+
+# 启动新编译的 release 版 (后台)
+source ~/.cargo/env
+./target/release/showen_v2 --config configs/dog_state_machine.json > /tmp/m21_e2e.log 2>&1 &
+APP_PID=$!
+echo "启动 PID=$APP_PID, 等待服务就绪..."
+
+# 等待 HTTP 服务就绪 (最多 15s)
+for i in $(seq 1 15); do
+    if curl -s http://127.0.0.1:5000/api/status > /dev/null 2>&1; then
+        echo "服务就绪 (${i}s)"
+        break
+    fi
+    sleep 1
+done
+
+# 测试 1: 模型管理 API
+echo ""
+echo "=== 测试 1: GET /api/models ==="
+MODELS_RESP=$(curl -s http://127.0.0.1:5000/api/models)
+echo "$MODELS_RESP" | python3 -c "
+import json, sys
+data = json.load(sys.stdin)
+if 'models' in data:
+    print(f'模型数: {len(data[\"models\"])}')
+    for m in data['models'][:4]:
+        status = '已下载' if m.get('downloaded') else '未下载'
+        print(f'  - {m[\"name\"]} ({m[\"kind\"]}) [{status}]')
+    print(f'配额: {data.get(\"quota\", 0) // (1024*1024)}MB, 已用: {data.get(\"used_space\", 0) // (1024*1024)}MB')
+else:
+    print('错误:', data)
+" 2>&1 || echo "模型 API 响应解析失败: $MODELS_RESP"
+
+# 测试 2: 文字对话 (LLM + TTS 管线, 跳过 ASR)
+echo ""
+echo "=== 测试 2: POST /api/chat/text ==="
+echo "输入: '你好，你叫什么名字？'"
+START=$(date +%s%N)
+CHAT_RESP=$(curl -s -X POST http://127.0.0.1:5000/api/chat/text \
+    -H "Content-Type: application/json" \
+    -d '{"text":"你好，你叫什么名字？","session_id":"e2e_test"}' \
+    --max-time 60)
+END=$(date +%s%N)
+MS=$(( (END - START) / 1000000 ))
+echo "响应耗时: ${MS}ms"
+
+echo "$CHAT_RESP" | python3 -c "
+import json, sys
+try:
+    data = json.load(sys.stdin)
+    if data.get('error'):
+        print(f'错误: {data[\"error\"]}')
+    else:
+        print(f'回复文本: {data.get(\"reply_text\", \"(空)\")}')
+        audio = data.get('reply_audio_path')
+        if audio:
+            print(f'回复音频: {audio}')
+        else:
+            print('回复音频: (无)')
+        print(f'会话: {data.get(\"session_id\")}')
+except Exception as e:
+    print(f'解析失败: {e}')
+    print(f'原始响应: {sys.stdin.read()[:200]}')
+" 2>&1
+
+# 检查音频文件是否真的生成
+echo ""
+echo "=== 检查 TTS 音频文件 ==="
+ls -lh /tmp/showen_ai/tts_*.wav 2>/dev/null | tail -3 || echo "无 TTS 音频文件"
+
+# 清理
+echo ""
+echo "=== 清理 ==="
+kill $APP_PID 2>/dev/null
+wait $APP_PID 2>/dev/null
+sleep 1
+
+# 恢复生产服务
+systemctl --user start showen_v2.service
+sleep 2
+systemctl --user is-active showen_v2.service
+echo "生产服务已恢复"
+
+echo ""
+echo "=== 测试完成 ==="
diff --git a/src/plugins/ai/model_manager.rs b/src/plugins/ai/model_manager.rs
index 5c29a91..bc881f5 100644
--- a/src/plugins/ai/model_manager.rs
+++ b/src/plugins/ai/model_manager.rs
@@ -148,82 +148,87 @@ impl ModelManager {
     }
 
     /// 初始化默认模型清单（首次启动或清单缺失时）
+    /// 每次启动都重新检查文件存在性，更新 downloaded 状态（符号链接可能后建）
     pub fn ensure_default_models(&mut self) -> Result<()> {
-        if !self.registry.models.is_empty() {
-            return Ok(());
+        // 首次：注册表为空，填充默认清单
+        if self.registry.models.is_empty() {
+            let defaults = vec![
+                ModelInfo {
+                    id: "qwen2.5-0.5b-q4_k_m".to_string(),
+                    kind: ModelKind::Llm,
+                    name: "Qwen2.5 0.5B Q4 (推荐默认)".to_string(),
+                    version: "0.5b".to_string(),
+                    size: 469 * 1024 * 1024,
+                    memory_required: 1024 * 1024 * 1024,
+                    recommended_tier: "4G 内存档可用".to_string(),
+                    url: "https://hf-mirror.com/Qwen/Qwen2.5-0.5B-Instruct-GGUF/resolve/main/qwen2.5-0.5b-instruct-q4_k_m.gguf".to_string(),
+                    sha256: String::new(),
+                    filename: "qwen2.5-0.5b-q4_k_m.gguf".to_string(),
+                },
+                ModelInfo {
+                    id: "gemma3-1b-q4_k_m".to_string(),
+                    kind: ModelKind::Llm,
+                    name: "Gemma3 1B Q4 (可选档)".to_string(),
+                    version: "1b".to_string(),
+                    size: 800 * 1024 * 1024,
+                    memory_required: 2 * 1024 * 1024 * 1024,
+                    recommended_tier: "建议 8G 以上".to_string(),
+                    url: "https://hf-mirror.com/google/gemma-3-1b-it-GGUF/resolve/main/gemma-3-1b-it-q4_k_m.gguf".to_string(),
+                    sha256: String::new(),
+                    filename: "gemma3-1b-q4_k_m.gguf".to_string(),
+                },
+                ModelInfo {
+                    id: "whisper-tiny".to_string(),
+                    kind: ModelKind::Asr,
+                    name: "Whisper Tiny (中文)".to_string(),
+                    version: "tiny".to_string(),
+                    size: 75 * 1024 * 1024,
+                    memory_required: 200 * 1024 * 1024,
+                    recommended_tier: "4G 内存档可用".to_string(),
+                    url: "https://hf-mirror.com/ggerganov/whisper.cpp/resolve/main/ggml-tiny.bin".to_string(),
+                    sha256: String::new(),
+                    filename: "ggml-tiny.bin".to_string(),
+                },
+                ModelInfo {
+                    id: "piper-zh-huayan".to_string(),
+                    kind: ModelKind::Tts,
+                    name: "Piper zh_CN huayan (中文女声)".to_string(),
+                    version: "medium".to_string(),
+                    size: 63 * 1024 * 1024,
+                    memory_required: 150 * 1024 * 1024,
+                    recommended_tier: "4G 内存档可用".to_string(),
+                    url: "https://hf-mirror.com/rhasspy/piper-voices/resolve/main/zh/zh_CN/huayan/medium/zh_CN-huayan-medium.onnx".to_string(),
+                    sha256: String::new(),
+                    filename: "zh_CN-huayan-medium.onnx".to_string(),
+                },
+            ];
+
+            for info in defaults {
+                self.registry.models.push(LocalModelEntry {
+                    info,
+                    downloaded: false,
+                    download_progress: 0,
+                });
+            }
+
+            // 设置默认 active 模型
+            if !self.registry.active.contains_key(&ModelKind::Llm) {
+                self.registry.active.insert(ModelKind::Llm, "qwen2.5-0.5b-q4_k_m".to_string());
+            }
+            if !self.registry.active.contains_key(&ModelKind::Asr) {
+                self.registry.active.insert(ModelKind::Asr, "whisper-tiny".to_string());
+            }
+            if !self.registry.active.contains_key(&ModelKind::Tts) {
+                self.registry.active.insert(ModelKind::Tts, "piper-zh-huayan".to_string());
+            }
         }
 
-        // Spike 推荐的默认模型清单
-        let defaults = vec![
-            ModelInfo {
-                id: "qwen2.5-0.5b-q4_k_m".to_string(),
-                kind: ModelKind::Llm,
-                name: "Qwen2.5 0.5B Q4 (推荐默认)".to_string(),
-                version: "0.5b".to_string(),
-                size: 469 * 1024 * 1024,
-                memory_required: 1024 * 1024 * 1024,
-                recommended_tier: "4G 内存档可用".to_string(),
-                url: "https://hf-mirror.com/Qwen/Qwen2.5-0.5B-Instruct-GGUF/resolve/main/qwen2.5-0.5b-instruct-q4_k_m.gguf".to_string(),
-                sha256: String::new(), // 实际部署时填充
-                filename: "qwen2.5-0.5b-q4_k_m.gguf".to_string(),
-            },
-            ModelInfo {
-                id: "gemma3-1b-q4_k_m".to_string(),
-                kind: ModelKind::Llm,
-                name: "Gemma3 1B Q4 (可选档)".to_string(),
-                version: "1b".to_string(),
-                size: 800 * 1024 * 1024,
-                memory_required: 2 * 1024 * 1024 * 1024,
-                recommended_tier: "建议 8G 以上".to_string(),
-                url: "https://hf-mirror.com/google/gemma-3-1b-it-GGUF/resolve/main/gemma-3-1b-it-q4_k_m.gguf".to_string(),
-                sha256: String::new(),
-                filename: "gemma3-1b-q4_k_m.gguf".to_string(),
-            },
-            ModelInfo {
-                id: "whisper-tiny".to_string(),
-                kind: ModelKind::Asr,
-                name: "Whisper Tiny (中文)".to_string(),
-                version: "tiny".to_string(),
-                size: 75 * 1024 * 1024,
-                memory_required: 200 * 1024 * 1024,
-                recommended_tier: "4G 内存档可用".to_string(),
-                url: "https://hf-mirror.com/ggerganov/whisper.cpp/resolve/main/ggml-tiny.bin".to_string(),
-                sha256: String::new(),
-                filename: "ggml-tiny.bin".to_string(),
-            },
-            ModelInfo {
-                id: "piper-zh-huayan".to_string(),
-                kind: ModelKind::Tts,
-                name: "Piper zh_CN huayan (中文女声)".to_string(),
-                version: "medium".to_string(),
-                size: 63 * 1024 * 1024,
-                memory_required: 150 * 1024 * 1024,
-                recommended_tier: "4G 内存档可用".to_string(),
-                url: "https://hf-mirror.com/rhasspy/piper-voices/resolve/main/zh/zh_CN/huayan/medium/zh_CN-huayan-medium.onnx".to_string(),
-                sha256: String::new(),
-                filename: "zh_CN-huayan-medium.onnx".to_string(),
-            },
-        ];
-
-        for info in defaults {
-            let filename = info.filename.clone();
-            let downloaded = self.store_dir.join(info.kind.dir_name()).join(&filename).exists();
-            self.registry.models.push(LocalModelEntry {
-                info,
-                downloaded,
-                download_progress: if downloaded { 100 } else { 0 },
-            });
-        }
-
-        // 设置默认 active 模型
-        if !self.registry.active.contains_key(&ModelKind::Llm) {
-            self.registry.active.insert(ModelKind::Llm, "qwen2.5-0.5b-q4_k_m".to_string());
-        }
-        if !self.registry.active.contains_key(&ModelKind::Asr) {
-            self.registry.active.insert(ModelKind::Asr, "whisper-tiny".to_string());
-        }
-        if !self.registry.active.contains_key(&ModelKind::Tts) {
-            self.registry.active.insert(ModelKind::Tts, "piper-zh-huayan".to_string());
+        // 每次启动都重新检查文件存在性（符号链接可能后建，或文件被手动删除）
+        for entry in &mut self.registry.models {
+            let path = self.store_dir.join(entry.info.kind.dir_name()).join(&entry.info.filename);
+            let exists = path.exists();
+            entry.downloaded = exists;
+            entry.download_progress = if exists { 100 } else { 0 };
         }
 
         self.save_registry()?;