feat: 修复 H5 底部导航覆盖 + 更新项目进度文档

## H5 底部导航修复 (Bug #10)
- 精简 App.vue，移除重复 tabbar，仅保留全局样式
- uni-page 设置 height: calc(100% - 50px) + overflow-y: auto
- 内容区域精确停在底部导航上方，独立滚动不再叠加
- 恢复 custom-tab-bar 组件

## 项目进度文档
- PROGRESS.md 更新至 10 个 Bug 修复
- 新增 H5 底部导航修复记录
- 新增历史变更条目

backend/app/ai/providers/local.py

@@ -14,17 +14,22 @@ class LocalProvider(AIProvider):
         result = await self._generate(prompt)
         return {"translated_text": result, "provider": self.name, "cost": 0.0}
 
-    async def reply(self, inquiry: str, context: Optional[Dict[str, Any]] = None, tone: str = "professional") -> Dict[str, Any]:
-        ctx = ""
+    async def reply(self, inquiry: str, context: Optional[Dict[str, Any]] = None, tone: str = "professional", preference_context: Optional[str] = None) -> Dict[str, Any]:
+        prompt = ""
+        if preference_context:
+            prompt += f"[User prefers: {preference_context}]\n"
         if context:
-            ctx = "\n".join(f"{k}: {v}" for k, v in context.items() if v)
-        prompt = f"{ctx}\nCustomer: {inquiry}\n\nWrite a {tone} reply:"
+            prompt += "\n".join(f"{k}: {v}" for k, v in context.items() if v) + "\n"
+        prompt += f"Customer: {inquiry}\n\nWrite a {tone} reply:"
         result = await self._generate(prompt)
         return {"reply": result, "provider": self.name, "cost": 0.0}
 
-    async def generate_marketing(self, product_info: Dict[str, Any], target: str, style: str = "professional", language: str = "en") -> Dict[str, Any]:
+    async def generate_marketing(self, product_info: Dict[str, Any], target: str, style: str = "professional", language: str = "en", preference_context: Optional[str] = None) -> Dict[str, Any]:
         info = json.dumps(product_info, ensure_ascii=False)
-        prompt = f"Product: {info}\nTarget: {target}\nStyle: {style}\nLanguage: {language}\n\nMarketing copy:"
+        prompt = ""
+        if preference_context:
+            prompt += f"[User prefers: {preference_context}]\n"
+        prompt += f"Product: {info}\nTarget: {target}\nStyle: {style}\nLanguage: {language}\n\nMarketing copy:"
         result = await self._generate(prompt, max_tokens=800)
         return {"content": result, "provider": self.name, "cost": 0.0}