refactor(api): restructured API for type safety, maintainability and docs generation

- These changes makes the API incombatible with previous versions
- Added new types for error handling, success responses, and health checks.
- Updated health check logic to utilize the new types for better clarity and structure.
- Refactored existing handlers to improve response consistency and error handling.
- Updated Makefile to include a new target for generating API types from Swagger.
- Updated "new agent" API to respond an encrypted cert pair

internal/logging/accesslog/retention.go

@@ -12,7 +12,7 @@ type Retention struct {
 	Days     uint64 `json:"days"`
 	Last     uint64 `json:"last"`
 	KeepSize uint64 `json:"keep_size"`
-}
+} // @name LogRetention
 
 var (
 	ErrInvalidSyntax = gperr.New("invalid syntax")