feat(db): add SqliteAdapter interface for multi-driver support

src/lib/db/adapters/types.ts

@@ -0,0 +1,34 @@
+export interface RunResult {
+  changes: number;
+  lastInsertRowid: number | bigint;
+}
+
+export interface PreparedStatement {
+  run(...params: unknown[]): RunResult;
+  get(...params: unknown[]): unknown;
+  all(...params: unknown[]): unknown[];
+}
+
+export interface SqliteAdapter {
+  readonly driver: "better-sqlite3" | "node:sqlite" | "sql.js";
+  readonly open: boolean;
+  readonly name: string;
+
+  prepare(sql: string): PreparedStatement;
+  exec(sql: string): void;
+  pragma(pragmaStr: string, options?: { simple?: boolean }): unknown;
+
+  /** Retorna uma função que quando chamada executa fn em uma transação DEFERRED */
+  transaction<T>(fn: (...args: unknown[]) => T): (...args: unknown[]) => T;
+
+  /** Executa fn em uma transação IMMEDIATE (adquire write lock imediatamente) */
+  immediate(fn: () => void): void;
+
+  /** Backup nativo ou file-copy fallback */
+  backup(destination: string): Promise<void>;
+
+  checkpoint(mode?: string): void;
+  close(): void;
+
+  readonly raw: unknown;
+}