feat: 服务管理支持 HTTP/HTTPS 协议选择

- Service 增加 scheme 字段，build_url 按协议拼接地址
- 表单新增协议下拉；启动时自动迁移已有 SQLite 库
- 更新部署说明中的 HTTPS 服务添加示例

Co-authored-by: Cursor <cursoragent@cursor.com>

app.py

@@ -118,6 +118,7 @@ def create_app() -> Flask:
 
     with app.app_context():
         db.create_all()
+        _migrate_schema()
         _ensure_default_user()
         _ensure_admin_from_env()
 
@@ -254,6 +255,7 @@ def create_app() -> Flask:
             path = (form.path.data or "").strip() or "/"
             s = Service(
                 name=form.name.data.strip(),
+                scheme=form.scheme.data,
                 host=form.host.data.strip(),
                 port=form.port.data,
                 path=path,
@@ -288,6 +290,7 @@ def create_app() -> Flask:
         ).all()
         if form.validate_on_submit():
             s.name = form.name.data.strip()
+            s.scheme = form.scheme.data
             s.host = form.host.data.strip()
             s.port = form.port.data
             s.path = (form.path.data or "").strip() or "/"
@@ -331,6 +334,28 @@ def create_app() -> Flask:
     return app
 
 
+def _migrate_schema() -> None:
+    """SQLite 已有库补列（db.create_all 不会 ALTER 已有表）。"""
+    from sqlalchemy import inspect, text
+
+    try:
+        insp = inspect(db.engine)
+        if "services" not in insp.get_table_names():
+            return
+        cols = {c["name"] for c in insp.get_columns("services")}
+        if "scheme" not in cols:
+            with db.engine.begin() as conn:
+                conn.execute(
+                    text(
+                        "ALTER TABLE services ADD COLUMN scheme VARCHAR(8) "
+                        "NOT NULL DEFAULT 'http'"
+                    )
+                )
+            print("[nav] 已为 services 表添加 scheme 列（默认 http）。", flush=True)
+    except Exception as exc:
+        print(f"[nav] 数据库结构迁移跳过或失败: {exc}", flush=True)
+
+
 def _first_group_id() -> Optional[int]:
     g = ServiceGroup.query.order_by(ServiceGroup.sort_order, ServiceGroup.id).first()
     return g.id if g else None