fix(db): stabilize connection settings and explicitly define AppConfig table name

- Set SQL connection idle limit to 1 to reduce resource usage
- Explicitly define AppConfig table name to prevent GORM pluralization issues

internal/db/Schema.go

@@ -19,6 +19,11 @@ type AppConfig struct {
 	FirstRun            bool    // Is this the first time the application has been run?
 }
 
+// Explicit table name to avoid pluralization issues
+func (AppConfig) TableName() string {
+	return "app_configs" // Use your ACTUAL table name (check with: sqlite3 database.sqlite ".tables")
+}
+
 type Log struct {
 	gorm.Model
 	Timestamp int64