feat: 添加 App 检查更新功能

- 前端：设置页面添加检查更新菜单项，从 pubspec.yaml 动态获取版本号
- 后端：新增 /api/v1/app/check-updates 接口，自动扫描 releases 目录对比版本
- 配置：新增 AppVersionSettings，支持通过环境变量配置版本和下载链接
- Docker：添加 releases 目录挂载

backend/src/v1/app/router.py

@@ -0,0 +1,116 @@
+from __future__ import annotations
+
+import re
+from pathlib import Path
+from typing import Literal
+
+from fastapi import APIRouter, Query
+from pydantic import BaseModel, Field
+
+from core.config.settings import config
+
+
+class AppVersionInfo(BaseModel):
+    has_update: bool = Field(description="是否有新版本可用")
+    latest_version: str = Field(description="最新版本号，如 0.1.0")
+    latest_build: int = Field(description="最新构建号")
+    min_required_version: str = Field(description="强制更新版本号")
+    update_type: Literal["none", "optional", "required"] = Field(
+        description="更新类型: none=无更新, optional=可选更新, required=必须更新"
+    )
+    download_url: str | None = Field(default=None, description="安装包下载链接")
+    release_notes: str | None = Field(default=None, description="版本更新说明")
+
+
+router = APIRouter(prefix="/app", tags=["app"])
+
+
+def _parse_version(filename: str) -> tuple[str, int] | None:
+    pattern = r"app[-_]v?(\d+\.\d+\.\d+)\+(\d+)\.(?:apk|ipa)"
+    match = re.search(pattern, filename, re.IGNORECASE)
+    if match:
+        version = match.group(1)
+        build = int(match.group(2))
+        return (version, build)
+    return None
+
+
+def _get_latest_release(
+    platform: Literal["ios", "android"],
+) -> tuple[str, int, str] | None:
+    releases_dir = config.app_version.releases_dir
+    base_path = Path.cwd().parent / "deploy" / "static" / releases_dir
+
+    if not base_path.exists():
+        return None
+
+    ext = "ipa" if platform == "ios" else "apk"
+    candidates = []
+
+    for f in base_path.iterdir():
+        if f.is_file() and f.suffix.lstrip(".").lower() == ext.lower():
+            parsed = _parse_version(f.name)
+            if parsed:
+                version, build = parsed
+                candidates.append((version, build, f.name))
+
+    if not candidates:
+        return None
+
+    candidates.sort(key=lambda x: (x[0], x[1]), reverse=True)
+    return candidates[0][0], candidates[0][1], candidates[0][2]
+
+
+def _compare_versions(
+    current_version: str, current_build: int, latest_version: str, latest_build: int
+) -> tuple[bool, Literal["none", "optional", "required"]]:
+    if current_build >= latest_build:
+        return False, "none"
+
+    if current_build < latest_build - 2:
+        return True, "required"
+    return True, "optional"
+
+
+@router.get("/check-updates", response_model=AppVersionInfo)
+async def check_updates(
+    current_version: str | None = Query(None, description="前端当前版本，如 0.1.0"),
+    current_build: int | None = Query(None, description="前端当前构建号，如 1"),
+    platform: Literal["ios", "android"] = Query("ios", description="平台类型"),
+) -> AppVersionInfo:
+    current_build = current_build or 0
+
+    latest = _get_latest_release(platform)
+    if not latest:
+        return AppVersionInfo(
+            has_update=False,
+            latest_version=config.app_version.current_version,
+            latest_build=config.app_version.current_build,
+            min_required_version=config.app_version.current_version,
+            update_type="none",
+            download_url=None,
+            release_notes=None,
+        )
+
+    latest_version, latest_build, filename = latest
+
+    has_update, update_type = _compare_versions(
+        current_version or "0.0.0",
+        current_build,
+        latest_version,
+        latest_build,
+    )
+
+    download_url: str | None = None
+    if has_update and config.app_version.download_base_url:
+        download_url = f"{config.app_version.download_base_url.rstrip('/')}/{config.app_version.releases_dir}/{filename}"
+
+    return AppVersionInfo(
+        has_update=has_update,
+        latest_version=latest_version,
+        latest_build=latest_build,
+        min_required_version=latest_version,
+        update_type=update_type,
+        download_url=download_url,
+        release_notes="问题修复和体验优化",
+    )

backend/src/v1/router.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 from fastapi import APIRouter
 
 from v1.agent.router import router as agent_router
+from v1.app.router import router as app_router
 from v1.auth.router import router as auth_router
 from v1.friendships.router import router as friendships_router
 from v1.inbox_messages.router import router as inbox_messages_router
@@ -12,8 +13,10 @@ from v1.users.router import router as users_router
 
 
 router = APIRouter(prefix="/api/v1")
+router.include_router(app_router)
 router.include_router(auth_router)
 router.include_router(agent_router)
+router.include_router(agent_router)
 router.include_router(friendships_router)
 router.include_router(users_router)
 router.include_router(schedule_items_router)