chore: clean up biome lint warnings — all non- intentional resolved

- Remove 25 unused imports across 14 test files
- Remove 1 unused variable (rename with _ prefix)
- Fix 2 noBannedTypes (Function → (...args: unknown[]) => unknown)
- Fix 1 useTemplate lint (string concat → template literal in merge-config.cjs)
- Fix 1 useNodejsImportProtocol (merge-config.cjs)
- Fix 2 noTemplateCurlyInString (generate-drizzle-schema.mjs generator code)
- Auto-fix formatting + import sorting across modified files
- 221 remaining warnings: intentional noExplicitAny in prisma-facade.ts (Prisma compat layer)
- 0 tsc errors, 583 tests passing

scripts/merge-config.cjs

@@ -1,4 +1,4 @@
-const fs = require("fs");
+const fs = require("node:fs");
 const JSON5 = require("json5");
 
 const exampleFile = process.argv[2];
@@ -50,4 +50,4 @@ const isJson5 = targetFile.endsWith(".json5");
 const output = isJson5
 	? JSON5.stringify(merged, null, 4)
 	: JSON.stringify(merged, null, 4);
-fs.writeFileSync(targetFile, output + "\n");
+fs.writeFileSync(targetFile, `${output}\n`);