chore(security,refactor): extract sanitization and improve code quality (#41)

* chore(security,refactor): extract sanitization and improve code quality

- [x] Extract sanitization functions to dedicated sanitization.go module
- [x] Add comprehensive golangci-lint v2 configuration with security rules
- [x] Replace interface{} with any type throughout codebase
- [x] Add admin API authentication security warning
- [x] Extract WebSocket and stats streaming constants
- [x] Add best-effort error handling comments for resource cleanup
- [x] Expand sensitive field patterns for improved PII redaction
- [x] Simplify safety checks and remove redundant nil validations
- [x] Improve test coverage for password field redaction patterns

* refactor: replace interface{} with any type alias

- [x] Replace all `map[string]interface{}` with `map[string]any`
- [x] Replace all `interface{}` with `any` in function signatures and type definitions
- [x] Update sync.Pool New function returns from `interface{}` to `any`
- [x] Add package documentation comments to 8 package files
- [x] Update type assertions and casts to work with `any` type

events.go

@@ -48,7 +48,7 @@ func enableHasuraEventCleaner(ctx context.Context) error {
 
 	logger.Info(&libpack_logger.LogMessage{
 		Message: "Event cleaner enabled",
-		Pairs:   map[string]interface{}{"interval_in_days": clearOlderThan},
+		Pairs:   map[string]any{"interval_in_days": clearOlderThan},
 	})
 
 	// Parse pool configuration
@@ -67,7 +67,7 @@ func enableHasuraEventCleaner(ctx context.Context) error {
 	if err != nil {
 		logger.Error(&libpack_logger.LogMessage{
 			Message: "Failed to create connection pool",
-			Pairs:   map[string]interface{}{"error": err.Error()},
+			Pairs:   map[string]any{"error": err.Error()},
 		})
 		return err
 	}
@@ -125,7 +125,7 @@ func cleanEvents(ctx context.Context, pool *pgxpool.Pool, clearOlderThan int, lo
 		} else {
 			logger.Debug(&libpack_logger.LogMessage{
 				Message: "Successfully executed query",
-				Pairs:   map[string]interface{}{"query": query, "interval": interval},
+				Pairs:   map[string]any{"query": query, "interval": interval},
 			})
 		}
 	}
@@ -137,7 +137,7 @@ func cleanEvents(ctx context.Context, pool *pgxpool.Pool, clearOlderThan int, lo
 		}
 		logger.Error(&libpack_logger.LogMessage{
 			Message: "Failed to execute some queries",
-			Pairs: map[string]interface{}{
+			Pairs: map[string]any{
 				"failed_queries": failedQueries,
 				"errors":         errMsgs,
 			},