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

internal/service/group_ability.go

@@ -0,0 +1,31 @@
+package service
+
+import "context"
+
+// GroupAbility 抽象群组能力校验，避免 chat_service 直接依赖 group_service 造成循环。
+//
+// 由 GroupService 实现并通过 wire 绑定；仅暴露 ChatService 所需的最小校验方法。
+type GroupAbility interface {
+	// CanSendGroupMessage 校验用户是否可在群组中发消息。
+	// 拒绝场景：非群成员、被单独禁言、群全员禁言。
+	CanSendGroupMessage(ctx context.Context, userID, groupID string) error
+}
+
+// GroupAbilityFunc 适配器类型，便于把闭包/wire 桥接
+// 转换为 GroupAbility 接口。
+type GroupAbilityFunc func(ctx context.Context, userID, groupID string) error
+
+func (f GroupAbilityFunc) CanSendGroupMessage(ctx context.Context, userID, groupID string) error {
+	return f(ctx, userID, groupID)
+}
+
+// NewGroupAbility 从 GroupService 构造 GroupAbility 适配器（wire 注册用）。
+//
+// 注意：GroupService.CanSendGroupMessage 当前签名不带 ctx，这里通过闭包桥接保持
+// GroupAbility 接口签名一致；后续 GroupService 演进为接受 ctx 时直接传递即可。
+func NewGroupAbility(groupService GroupService) GroupAbility {
+	return GroupAbilityFunc(func(ctx context.Context, userID, groupID string) error {
+		_ = ctx
+		return groupService.CanSendGroupMessage(userID, groupID)
+	})
+}