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/wire/identity_provider.go

@@ -0,0 +1,54 @@
+package wire
+
+import (
+	"context"
+
+	"with_you/internal/middleware"
+	"with_you/internal/model"
+	"with_you/internal/repository"
+	"with_you/internal/service"
+)
+
+// ProvideIdentityProvider 提供认证管道依赖的 IdentityProvider 实现。
+//
+// 把 UserService + CasbinService + SessionRepository 组合为中间件所需的查询接口，
+// 避免中间件直接依赖具体 service 三个包，便于测试以 fake 注入。
+func ProvideIdentityProvider(
+	userService service.UserService,
+	casbinService service.CasbinService,
+	sessionRepo repository.SessionRepository,
+) middleware.IdentityProvider {
+	return &identityProviderImpl{
+		userService:   userService,
+		casbinService: casbinService,
+		sessionRepo:   sessionRepo,
+	}
+}
+
+type identityProviderImpl struct {
+	userService   service.UserService
+	casbinService service.CasbinService
+	sessionRepo   repository.SessionRepository
+}
+
+func (i *identityProviderImpl) GetUserByID(ctx context.Context, userID string) (*model.User, error) {
+	return i.userService.GetUserByID(ctx, userID)
+}
+
+func (i *identityProviderImpl) GetRolesForUser(ctx context.Context, userID string) ([]string, error) {
+	roles, err := i.casbinService.GetRolesForUser(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+	if roles == nil {
+		roles = []string{}
+	}
+	return roles, nil
+}
+
+func (i *identityProviderImpl) GetSessionByID(ctx context.Context, sessionID string) (*model.Session, error) {
+	if sessionID == "" {
+		return nil, nil
+	}
+	return i.sessionRepo.GetByID(ctx, sessionID)
+}