feat(types): add comprehensive type definitions for @jlongster/sql.js

- Add FileSystem and FileStream interfaces for filesystem operations

- Update Database interface with proper Promise-based return types

- Add QueryExecResult interface for structured query results

- Include FS and register_for_idb in initialization result

- Fix Database constructor to support path and options parameters

- Add proper JSDoc documentation with author and description

This change resolves TypeScript compilation errors in AbsurdSqlDatabaseService by providing complete type coverage for the SQL.js WASM module with filesystem support.

src/types/sql.js.d.ts

@@ -0,0 +1,57 @@
+/**
+ * Type definitions for @jlongster/sql.js
+ * @author Matthew Raymer
+ * @description TypeScript declaration file for the SQL.js WASM module with filesystem support
+ */
+
+declare module '@jlongster/sql.js' {
+  export interface FileSystem {
+    mkdir(path: string): void;
+    mount(fs: any, opts: any, mountpoint: string): void;
+    open(path: string, flags: string): FileStream;
+    close(stream: FileStream): void;
+  }
+
+  export interface FileStream {
+    node: {
+      contents: {
+        readIfFallback(): Promise<void>;
+      };
+    };
+  }
+
+  export interface Database {
+    exec(sql: string, params?: any[]): Promise<QueryExecResult[]>;
+    prepare(sql: string): Statement;
+    run(sql: string, params?: any[]): Promise<{ changes: number; lastId?: number }>;
+    close(): void;
+  }
+
+  export interface QueryExecResult {
+    columns: string[];
+    values: any[][];
+  }
+
+  export interface Statement {
+    bind(params: any[]): void;
+    step(): boolean;
+    get(): any[];
+    getColumnNames(): string[];
+    reset(): void;
+    free(): void;
+  }
+
+  export interface InitSqlJsStatic {
+    (config?: {
+      locateFile?: (file: string) => string;
+      wasmBinary?: ArrayBuffer;
+    }): Promise<{
+      Database: new (path?: string | Uint8Array, opts?: { filename?: boolean }) => Database;
+      FS: FileSystem;
+      register_for_idb: (fs: any) => void;
+    }>;
+  }
+
+  const initSqlJs: InitSqlJsStatic;
+  export default initSqlJs;
+}