feat(auth): implement session-based token management with revocation support

Add Session model, SessionService, and SessionRepository to track user login
sessions and enable token revocation on auth-critical events.

- Introduce explicit TokenType (access/refresh) in JWT claims to prevent
  refresh token misuse via access token endpoints
- Add SessionID field to JWT claims, enabling stateless JWT validation
  against revoked sessions
- Replace legacy Auth middleware with RequireAuth/OptionalAuth pipeline
  that validates token type, account status, and session validity
- Implement session revocation on password change, reset, user ban/inactive,
  and explicit logout
- Add Principal cache with active invalidation for banned/role-changed users
- Fix IDOR vulnerability: GetMessagesByCursor now validates currentUserID
  is conversation participant via GetParticipantStrict
- Add group member visibility checks: announcements, group info, member list
  now require group membership
- Simplify Casbin policy: remove g grouping, use r.sub == p.sub matcher
  with globMatch; user_roles table is single source of truth for roles
- Add migration logic to clean legacy casbin g rules and migrate old p rules
  from path-style to admin/<domain> resource naming

configs/casbin/model.conf

@@ -10,5 +10,14 @@ g = _, _
 [policy_effect]
 e = some(where (p.eft == allow))
 
+# 真源策略：user_roles 表为用户-角色唯一真源；Casbin 仅存 p, role, resource, action。
+# EnforceForUser 由 CasbinService 先查 DB 角色再对每个角色调 Enforce(role, obj, act)，
+# 因此 matcher 直接匹配 r.sub == p.sub（角色直接匹配），不再依赖 g 分组。
+#
+# matcher 使用 globMatch（doublestar 语义）：
+#   - '* 匹配单层资源段（不跨 '/'）；
+#   - '**' 跨多层（如 admin/** 命中 admin/users/roles/write）。
+# 资源命名采用路径式 admin/<domain>[/<sub>]，避免 keyMatch2 把 '*' 当作正则通配
+# 跨 '.' 而误匹配；也避免 globMatch 在点号分隔下 '*' 仍跨 '.' 的过宽问题。
 [matchers]
-m = g(r.sub, p.sub) && keyMatch2(r.obj, p.obj) && (r.act == p.act || p.act == "*")
+m = r.sub == p.sub && globMatch(r.obj, p.obj) && (r.act == p.act || p.act == "*")