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/claude.py

@@ -32,8 +32,10 @@ class ClaudeProvider(AIProvider):
         content = await self._call(system, prompt)
         return {"translated_text": content, "provider": self.name}
 
-    async def reply(self, inquiry: str, context: Optional[Dict[str, Any]] = None, tone: str = "professional") -> Dict[str, Any]:
+    async def reply(self, inquiry: str, context: Optional[Dict[str, Any]] = None, tone: str = "professional", preference_context: Optional[str] = None) -> Dict[str, Any]:
         system = SYSTEM_PROMPTS["reply"]
+        if preference_context:
+            system += f"\nUser writing preference: {preference_context}"
         context_str = ""
         if context:
             for k, v in context.items():
@@ -43,8 +45,10 @@ class ClaudeProvider(AIProvider):
         content = await self._call(system, prompt)
         return {"reply": content, "provider": self.name}
 
-    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]:
         system = SYSTEM_PROMPTS["marketing"]
+        if preference_context:
+            system += f"\nUser preference: {preference_context}"
         info = json.dumps(product_info, ensure_ascii=False, indent=2)
         prompt = f"Product:\n{info}\n\nTarget: {target}\nStyle: {style}\nLanguage: {language}\n\nWrite marketing copy:"
         content = await self._call(system, prompt, max_tokens=1500)