feat(wave5): CI/CD pipeline + Vault KMS + OKR deploy to port 80/3001

Infrastructure (H3 CI gate, H5 KMS):
- Gitea Actions enabled (GITEA__actions__ENABLED=true)
- act_runner: Docker-outside-of-Docker for deploy job
- Vault Transit RSA-2048 signing keys (casan-audit-key, casan-policy-key)

Vault KMS scripts (H5 governance):
- .specify/scripts/bash/vault-kms.sh — sign/verify/pubkey/ensure-key
- .specify/scripts/bash/sign-audit-head.sh — sign audit chain via Vault
- Updated sign-policy-bundle.sh — Vault path + local fallback
- Updated security-gate.sh — KMS gate added (PASS=11 FAIL=0)

OKR app deployment (port 80/3001):
- Dockerfile.backend — node:22-slim (node:sqlite requires Node 22)
- Dockerfile.frontend — node:20-alpine build + nginx:alpine runtime
- nginx/nginx.conf — React SPA + /api/v1/* proxy to okr-backend:3001
- backend/entrypoint.sh — auto init DB on first run + seed
- .dockerignore

CI pipeline (.gitea/workflows/ci.yml):
- Job 1: Vitest frontend tests (H3)
- Job 2: CASAN security gate + Vault KMS signing (H4/H5)
- Job 3: Deploy OKR → port 80 (runs on push to main after tests pass)

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

AINative_OKR_CASAN5/Dockerfile.frontend

@@ -0,0 +1,28 @@
+# ─── Stage 1: Build ──────────────────────────────────────────────────────────
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# VITE_API_BASE_URL is baked into the bundle at build time.
+# Use a relative path so the image works with any hostname/IP — nginx
+# running on the same host proxies /api/v1/* to the backend container.
+ARG VITE_API_BASE_URL=/api/v1
+ENV VITE_API_BASE_URL=$VITE_API_BASE_URL
+
+COPY package.json package-lock.json ./
+COPY frontend/package.json ./frontend/
+COPY backend/package.json ./backend/
+
+RUN npm ci -w frontend
+
+COPY frontend ./frontend
+
+RUN npm run build -w frontend
+
+# ─── Stage 2: nginx runtime ──────────────────────────────────────────────────
+FROM nginx:alpine AS runtime
+
+COPY --from=builder /app/frontend/dist /usr/share/nginx/html
+COPY nginx/nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80