refactor(structure): promote app to repo root + remove redundant workspace cruft

Standard production layout: the OKR app (was nested under AINative_OKR_CASAN5/) is now
the repository root. No more wrapper directory.

- Promote AINative_OKR_CASAN5/* -> repo root (backend/ frontend/ packages/ apps/
  .specify/ docs/ infra/ nginx/ scripts/ + configs). Merge tool dirs: .gitea (kept the
  active deploy ci.yml, added harness-ci.yml + runbooks), .claude (agents/commands +
  launch.json), .github moved up.
- Remove redundant: 00_SUBMISSION_PACKAGE, scattered root notes (FPT_CASAN_Full.md,
  tu-tuong-casan.md, casan-tu-sinh..., casan_harness_assessment.md, source-review...,
  README_CASAN5_REFINED.md), casan-next-plans/ and optimize-docs/ (competition/planning
  artifacts — roadmap + design history preserved in git log / commit messages).
- Update all references to the old layout:
  - .gitea/workflows/{ci,harness-ci}.yml, .github/workflows/{ci,deploy}.yml:
    working-directory .; drop AINative_OKR_CASAN5/ prefix; .specify/{tests,scripts}
    -> packages/casan-harness/... (.specify/logs state kept)
  - .claude/launch.json, .gitea/*-runbook.md: path prefixes
  - CLAUDE.md, README.md: docs/input -> apps/okr/domain/input
  - policy-bundle.yaml: 8 policy paths -> packages/casan-harness/...; manifest re-signed
- secrets-scan.sh: fixture excludes -> new package/domain paths.

Full gate from the new root: PASS=64 FAIL=0 SKIP=3.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/workflows/deploy.yml

@@ -0,0 +1,45 @@
+name: Deploy
+
+# Triggers only after CI passes on main — this is the gate
+on:
+  workflow_run:
+    workflows: [CI]
+    branches: [main]
+    types: [completed]
+
+jobs:
+  deploy:
+    name: Deploy to Production
+    runs-on: ubuntu-latest
+    environment: production
+    # Only deploy when CI succeeded — not on failure or cancel
+    if: github.event.workflow_run.conclusion == 'success'
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: npm
+          cache-dependency-path: package-lock.json
+
+      - name: Install dependencies
+        working-directory: .
+        run: npm ci
+
+      - name: Build backend
+        working-directory: ./backend
+        run: npm run build
+
+      - name: Build frontend
+        working-directory: ./frontend
+        run: npm run build
+
+      # TODO: replace with your actual deploy command, e.g.:
+      #   - rsync -av dist/ user@server:/var/www/app/
+      #   - fly deploy
+      #   - vercel --prod
+      #   - aws s3 sync frontend/dist/ s3://your-bucket
+      - name: Deploy
+        run: echo "All tests passed — add deploy commands here"