…olations

…e to resolve OCP violation

…ervice god struct

Extract authentication utilities into standalone package-level functions
that accept *store.Store as parameter. This is the prerequisite for
extracting individual domain services from the god struct.

Also fixes recursive call bug in requireAI method.

…notes

…actors

Replace all hardcoded strings.Split(name, "/") patterns with standardized
resource name extractors. Added compound extractors:
- ExtractUserAndShortcutIDFromName
- ExtractUserAndWebhookIDFromName
- ExtractUserAndSettingKeyFromName
- ExtractUserAndPATIDFromName
- ExtractWebhookIDFromResourceName

…t domain services

1. Extracted 9 dedicated domain struct receivers (UserService, MemoService, etc.)
2. Migrated all pseudo-stub methods (UnimplementedXxx) out of APIV1Service.
3. Repurposed APIV1Service as a pure Gateway and Dependency Injector.
4. Rewired all gRPC Gateway interceptors and Connect service delegators to target domain receivers seamlessly.
5. Standardized common dependencies and decoupled generic filter validator.
6. Cleaned up remaining backward compatibility wrapper functions and staticcheck warnings.