feat(auth): replace internal auth with JWT token service

- Replace InternalAuthService with TokenService using JWT tokens
- Add support for token issuance, refresh, verification and revocation
- Implement automatic signing key rotation with Redis storage
- Add database migration checks for indexes and foreign key constraints
- Update gRPC endpoints to use token-based authentication
- Remove deprecated API key based authentication system
- Add JSON Web Token support with HMAC-SHA256 signing
- Implement refresh token handling with automatic rotation
- Add token revocation by JTI and user ID
- Update build configuration to include core proto files
- Migrate database schema to handle token-based authentication
- Add comprehensive token validation and verification logic

proto/this/im/auth.proto

@@ -1,26 +0,0 @@
-syntax = "proto3";
-
-package appks.im.v1;
-
-// Internal service-to-service authentication.
-// appks issues API keys (stored in Redis), remote services
-// carry the key in gRPC metadata "x-api-key", and call
-// Authenticate to verify identity.
-
-message AuthenticateRequest {
-  string api_key = 1;
-}
-
-message AuthenticateResponse {
-  bool authenticated = 1;
-  string service_name = 2;
-  string service_id = 3;
-  repeated string scopes = 4;
-  int64 expires_at = 5;
-}
-
-service InternalAuthService {
-  // Verify an API key and return the associated service identity.
-  // Called by remote services to authenticate themselves.
-  rpc Authenticate(AuthenticateRequest) returns (AuthenticateResponse);
-}