fix: refactor commitAndPush function to improve clarity and maintainability

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine
 
-RUN apk add --no-cache nodejs npm git \
+RUN apk add --no-cache bash nodejs npm git \
     && node --version \
     && npm --version \
     && git --version

app/git.js

@@ -15,7 +15,27 @@ export async function commitAndPush(workspace) {
     .replace('https://', `https://${GITEA_TOKEN}@`)
     .replace('http://', `http://${GITEA_TOKEN}@`) + `/${GITEA_REPOSITORY}.git`;
 
-  try {
+  // try {
+  //   git(['config', 'user.email', 'ai-review[bot]@gitea'], repoDir);
+  //   git(['config', 'user.name', 'AI Review Bot'], repoDir);
+  //   git(['fetch', 'origin', PR_HEAD_BRANCH], repoDir);
+  //   git(['checkout', PR_HEAD_BRANCH], repoDir);
+  //   git(['add', FINDINGS_PATH], repoDir);
+
+  //   const status = git(['status', '--porcelain'], repoDir);
+  //   if (!status) {
+  //     console.log('  findings.json 無變更，跳過 commit');
+  //     return;
+  //   }
+
+  //   const out = git(['commit', '-m', 'chore: update ai-review findings [skip ci]'], repoDir);
+  //   const commitHash = out.match(/\[.+ ([a-f0-9]+)\]/)?.[1] || 'unknown';
+  //   git(['push', remoteUrl, PR_HEAD_BRANCH], repoDir);
+  //   console.log(`  ✅ persisted findings  commit=${commitHash}  push=${PR_HEAD_BRANCH}`);
+  // } catch (e) {
+  //   console.log(`  ⚠️  Runner failed: commit/push 失敗: ${e.message}`);
+  // }
+
   git(['config', 'user.email', 'ai-review[bot]@gitea'], repoDir);
   git(['config', 'user.name', 'AI Review Bot'], repoDir);
   git(['fetch', 'origin', PR_HEAD_BRANCH], repoDir);
@@ -32,7 +52,4 @@ export async function commitAndPush(workspace) {
   const commitHash = out.match(/\[.+ ([a-f0-9]+)\]/)?.[1] || 'unknown';
   git(['push', remoteUrl, PR_HEAD_BRANCH], repoDir);
   console.log(`  ✅ persisted findings  commit=${commitHash}  push=${PR_HEAD_BRANCH}`);
-  } catch (e) {
-    console.log(`  ⚠️  Runner failed: commit/push 失敗: ${e.message}`);
-  }
 }