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/api/v1/teams.py

@@ -0,0 +1,117 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.ext.asyncio import AsyncSession
+from typing import Annotated, Optional
+from pydantic import BaseModel
+from app.database import get_db
+from app.services.team import TeamService
+from app.api.v1.deps import get_current_user_id
+
+router = APIRouter()
+
+
+class CreateTeamRequest(BaseModel):
+    name: str
+    description: Optional[str] = None
+
+
+class InviteRequest(BaseModel):
+    user_id: str
+
+
+class UpdateRoleRequest(BaseModel):
+    role: str
+
+
+@router.post("")
+async def create_team(
+    data: CreateTeamRequest,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = TeamService(db)
+    try:
+        team = await service.create_team(user_id, data.name, data.description)
+        return team
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("")
+async def list_teams(
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = TeamService(db)
+    return {"teams": await service.list_user_teams(user_id)}
+
+
+@router.get("/{team_id}")
+async def get_team(
+    team_id: str,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = TeamService(db)
+    team = await service.get_team(team_id, user_id)
+    if not team:
+        raise HTTPException(status_code=404, detail="Team not found")
+    return team
+
+
+@router.post("/{team_id}/invite")
+async def invite_member(
+    team_id: str,
+    data: InviteRequest,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = TeamService(db)
+    try:
+        result = await service.invite_member(team_id, user_id, data.user_id)
+        return result
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.delete("/{team_id}/members/{member_id}")
+async def remove_member(
+    team_id: str,
+    member_id: str,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = TeamService(db)
+    success = await service.remove_member(team_id, user_id, member_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Member not found or not removable")
+    return {"message": "Member removed"}
+
+
+@router.post("/{team_id}/leave")
+async def leave_team(
+    team_id: str,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = TeamService(db)
+    success = await service.leave_team(team_id, user_id)
+    if not success:
+        raise HTTPException(status_code=400, detail="Cannot leave as owner or not a member")
+    return {"message": "Left team"}
+
+
+@router.patch("/{team_id}/members/{member_id}/role")
+async def update_member_role(
+    team_id: str,
+    member_id: str,
+    data: UpdateRoleRequest,
+    user_id: str = Depends(get_current_user_id),
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    service = TeamService(db)
+    if data.role not in ("admin", "member", "viewer"):
+        raise HTTPException(status_code=400, detail="Invalid role")
+    success = await service.update_role(team_id, user_id, member_id, data.role)
+    if not success:
+        raise HTTPException(status_code=404, detail="Member not found or not updatable")
+    return {"message": "Role updated"}