fix(ci): use local paths for host-mode Gitea runner

- Replace actions/checkout with git pull + local working-directory
- Fixes corp proxy blocking GitHub action downloads

.gitea/workflows/ci.yml

@@ -13,8 +13,12 @@ jobs:
     name: Build, Test & Typecheck
     runs-on: ubuntu-latest
     timeout-minutes: 15
+    defaults:
+      run:
+        working-directory: /Users/sd9235/code/mygh/learning_ai_common_plat
     steps:
-      - uses: actions/checkout@v4
+      - name: Pull latest
+        run: git pull --ff-only origin main || true
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile