refactor: migrate all log statements to structured logger calls for improved observability

internal/db/db.go

@@ -3,8 +3,8 @@ package db
 import (
 	"database/sql"
 	"fmt"
-	"log"
 
+	"github.com/hireme/hireme/internal/logger"
 	_ "github.com/mattn/go-sqlite3"
 )
 
@@ -31,7 +31,7 @@ func InitDB(dbPath string) (*DB, error) {
 		return nil, fmt.Errorf("failed to run sqlite migrations: %w", err)
 	}
 
-	log.Printf("[DB] SQLite database initialized successfully at %s", dbPath)
+	logger.Log.Infow("SQLite database initialized successfully", "component", "DB", "dbPath", dbPath)
 	return database, nil
 }