chore(ci): add website relay and backend PR validation

.github/pull_request_template.md

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+## Purpose
+<!-- What problem, bug, or feature does this PR address? -->
+
+## Related Issue
+<!-- Closes # or Fixes # -->
+Closes #
+
+## Changes
+<!-- High-level bullet points of what code changed -->
+
+## Architecture Impact
+<!-- What subsystem or data flow is affected? -->
+
+## Risk Boundaries
+<!-- Check all subsystems touched by this PR -->
+- [ ] Telemetry acquisition (FROZEN 20 Hz pipeline)
+- [ ] Sensor fusion / lean angle
+- [ ] GNSS / speed processing
+- [ ] Ride persistence / state machine
+- [ ] Database / Drift Schema 7
+- [ ] Authentication / security rules
+- [ ] Website (Next.js / Founder Portal / Ops Console)
+- [ ] Backend / FastAPI API
+- [ ] Routing / Waze relay
+- [ ] None
+
+## Database Impact
+<!-- Schema version, migration logic, or None. Never change Schema 7 without explicit migration tests. -->
+None
+
+## Validation Actually Executed
+<!-- IMPORTANT: List only exact commands actually executed in this session. NEVER state "all tests pass" unless specifically executed. -->
+```bash
+# Example:
+# flutter analyze
+# flutter test
+# flutter build apk --debug
+# npm --prefix website run build
+# npm --prefix server/waze_relay test
+```
+
+## Manual Testing
+<!-- What manual, physical device, or browser testing was performed, if any? -->
+
+## Review Focus
+<!-- Specific files, security boundaries, or edge cases reviewers should inspect closely. -->
+
+## Documentation
+- [ ] Documentation updated
+- [ ] Documentation not required for this change

.github/workflows/backend-ci.yml

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+name: MotorSignal Backend CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: backend-ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  backend-api-tests:
+    name: Backend API tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: backend/motorsignal_api
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+          cache: 'pip'
+          cache-dependency-path: backend/motorsignal_api/requirements.lock
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.lock pytest httpx
+
+      - name: Run Firebase Auth signature and claims tests
+        run: python tests/test_firebase_auth.py
+
+      - name: Run isolated API and Operations unit tests
+        run: |
+          pytest tests/test_ops_support.py tests/test_ops_incidents.py tests/test_legacy_admin_retirement.py -v

.github/workflows/waze-relay-ci.yml

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+name: MotorSignal Waze Relay CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: waze-relay-ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  waze-relay-tests:
+    name: Waze relay tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: server/waze_relay
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: server/waze_relay/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run relay tests
+        run: npm test

.github/workflows/website-ci.yml

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+name: MotorSignal Website CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: website-ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  website-build-and-tests:
+    name: Website build and regression tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: website
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: website/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build Next.js application
+        run: npm run build
+
+      - name: Run Founder Portal tests
+        run: node tests/founder-portal.test.cjs
+
+      - name: Run Operations Console tests
+        run: node tests/ops-experience.test.cjs
+
+      - name: Run Responsive Layout tests
+        run: node tests/responsive-layout.test.cjs
+
+      - name: Run Navigation and Auth tests
+        run: node tests/navigation-auth.cjs