feat: update APKs API to include environment metadata

- Add parseApkFilename() integration to extract environment and commit info
- Return environment field (dev/sandbox/product/other) in API response
- Return commit field (short commit ID) in API response
- Add comprehensive test coverage for the new metadata

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/api/apks/route.ts

@@ -1,6 +1,7 @@
 // app/api/apks/route.ts
 import { NextResponse } from 'next/server';
 import { getApks } from '@/lib/fs-utils';
+import { parseApkFilename } from '@/lib/apk-parser';
 
 export async function GET(request: Request) {
   const { searchParams } = new URL(request.url);
@@ -17,12 +18,17 @@ export async function GET(request: Request) {
 
   try {
     const apks = await getApks(project, version, commitId);
-    const apksWithUrls = apks.map(apk => ({
-      ...apk,
-      modifiedAt: apk.modifiedAt.toISOString(),
-      downloadUrl: `/api/download?project=${encodeURIComponent(project)}&version=${encodeURIComponent(version)}&filename=${encodeURIComponent(apk.name)}`,
-    }));
-    return NextResponse.json(apksWithUrls);
+    const apksWithMetadata = apks.map(apk => {
+      const parsed = parseApkFilename(apk.name);
+      return {
+        ...apk,
+        environment: parsed.environment,
+        commit: parsed.commit,
+        modifiedAt: apk.modifiedAt.toISOString(),
+        downloadUrl: `/api/download?project=${encodeURIComponent(project)}&version=${encodeURIComponent(version)}&filename=${encodeURIComponent(apk.name)}`,
+      };
+    });
+    return NextResponse.json(apksWithMetadata);
   } catch (error) {
     return NextResponse.json(
       { error: 'Failed to fetch APK files' },