feat: add script to clean duplicate constraints in SQL file

- Introduced a new script `clean-duplicate-constraints.ts` that reads the SQL file
  and removes duplicate UNIQUE constraints identified by a numeric suffix in their names.
- The script logs the removed constraints and outputs the cleaned content back to the file.

scripts/clean-duplicate-constraints.ts

@@ -0,0 +1,22 @@
+import { readFileSync, writeFileSync } from 'fs';
+
+const filePath = './src/db/drizzle/0000_groovy_red_skull.sql';
+const content = readFileSync(filePath, 'utf-8');
+
+const lines = content.split('\n');
+let removedCount = 0;
+const cleaned: string[] = [];
+
+for (const line of lines) {
+  // 匹配 CONSTRAINT "表名_字段名_key数字" UNIQUE(...) 形式的约束（有数字后缀的是重复）
+  const match = line.match(/^\s*CONSTRAINT\s+"\w+_key\d+"\s+UNIQUE/i);
+  if (match) {
+    console.log(`[REMOVE] ${line.trim()}`);
+    removedCount++;
+    continue;
+  }
+  cleaned.push(line);
+}
+
+writeFileSync(filePath, cleaned.join('\n'));
+console.log(`\n[DONE] Removed ${removedCount} duplicate constraints`);