Add project files:

- Add database initialization scripts
- Add configuration files
- Add documentation
- Add public assets
- Add source code structure
- Update README

src/lib/db/optOutDb.ts

@@ -0,0 +1,51 @@
+import { Database } from 'better-sqlite3';
+import path from 'path';
+
+interface OptOutEntry {
+  domain: string;
+  email: string;
+  reason?: string;
+  timestamp: Date;
+}
+
+export class OptOutDatabase {
+  private db: Database;
+
+  constructor() {
+    this.db = new Database(path.join(__dirname, '../../../data/optout.db'));
+    this.initializeDatabase();
+  }
+
+  private initializeDatabase() {
+    this.db.exec(`
+      CREATE TABLE IF NOT EXISTS opt_outs (
+        domain TEXT PRIMARY KEY,
+        email TEXT NOT NULL,
+        reason TEXT,
+        timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
+      );
+      CREATE INDEX IF NOT EXISTS idx_domain ON opt_outs(domain);
+    `);
+  }
+
+  async addOptOut(entry: OptOutEntry): Promise<void> {
+    const stmt = this.db.prepare(
+      'INSERT OR REPLACE INTO opt_outs (domain, email, reason, timestamp) VALUES (?, ?, ?, ?)'
+    );
+    stmt.run(entry.domain, entry.email, entry.reason, entry.timestamp.toISOString());
+  }
+
+  isOptedOut(domain: string): boolean {
+    const stmt = this.db.prepare('SELECT 1 FROM opt_outs WHERE domain = ?');
+    return stmt.get(domain) !== undefined;
+  }
+
+  removeOptOut(domain: string): void {
+    const stmt = this.db.prepare('DELETE FROM opt_outs WHERE domain = ?');
+    stmt.run(domain);
+  }
+
+  getOptOutList(): OptOutEntry[] {
+    return this.db.prepare('SELECT * FROM opt_outs').all();
+  }
+}