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>

.gitea/act-runner-config.yaml

@@ -0,0 +1,37 @@
+# act_runner configuration for CASAN CI on Oracle Cloud VPS (1 GB RAM)
+# Deploy to: /opt/gitea/act-runner-config.yaml on the VPS.
+
+log:
+  level: info
+
+runner:
+  # Unique name shown in Gitea → Site Administration → Runners
+  name: "casan-runner-oracle"
+
+  # Only 1 concurrent job — VPS has 1 GB RAM (Gitea ≈ 200 MB + job container ≈ 300 MB)
+  capacity: 1
+
+  # Map "ubuntu-latest" jobs to the catthehacker image that has git, curl, jq,
+  # openssl, Node.js 18, and Python3 pre-installed. The workflow steps upgrade
+  # Node.js to 20 via actions/setup-node and add python-is-python3.
+  labels:
+    - "ubuntu-latest:docker://catthehacker/ubuntu:act-22.04"
+
+  # How often the runner polls Gitea for new jobs
+  fetch_interval: 5s
+  fetch_timeout: 30s
+
+  # Where to store the runner's working directory (inside the container)
+  # Default is /workspace — works fine.
+
+container:
+  network: gitea_default
+
+  # --memory 768m: allow harness tests headroom while leaving ~300MB for Gitea/Vault/OS.
+  # Jobs run sequentially (capacity: 1) so two containers never compete.
+  # NOTE: act_runner already passes /var/run/docker.sock from its own mounts to job
+  # containers; do NOT add it here or Docker will reject the duplicate bind mount.
+  options: "--memory 768m --cpus 1.5"
+
+  valid_volumes:
+    - "**"