diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index e1d325f3..52735f8d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -96,6 +96,27 @@ jobs:
           fi
           echo "✅ ADR 檢查通過"
 
+      # Phase 14.2 #96: 後端分層檢查 (輕量版 import-linter)
+      - name: API Layer Check
+        run: |
+          echo "🔍 檢查後端分層規則..."
+          # 檢查 1: services 層禁止引用 api/routers 層 (反向依賴)
+          if grep -rE "from src\.(api|routers)" apps/api/src/services/ 2>/dev/null; then
+            echo "❌ 分層違規: services 禁止引用 api/routers 層"
+            exit 1
+          fi
+          # 檢查 2: repositories 層禁止引用 services 層
+          if grep -rE "from src\.services" apps/api/src/repositories/ 2>/dev/null; then
+            echo "❌ 分層違規: repositories 禁止引用 services 層"
+            exit 1
+          fi
+          # 檢查 3: models 層禁止引用業務層
+          if grep -rE "from src\.(services|api|routers)" apps/api/src/models/ 2>/dev/null; then
+            echo "❌ 分層違規: models 禁止引用業務層"
+            exit 1
+          fi
+          echo "✅ 後端分層檢查通過"
+
   # ==================== Test ====================
   test:
     name: Test
@@ -282,14 +303,15 @@ jobs:
           uv sync
           uv run pytest tests/test_action_parsing.py -v --tb=short || echo "⚠️ 部分測試失敗"
 
-      - name: Prompt Validation Test
-        working-directory: apps/api
-        env:
-          PYTHONPATH: ${{ github.workspace }}/apps/api
-          OLLAMA_URL: http://192.168.0.188:11434
+      # 🔴 LLM 測試移至 Nightly (2026-03-26)
+      # 原因: CPU 推理需 300+ 秒/測試，不適合每次 commit
+      # 完整測試: .github/workflows/nightly-llm.yaml
+      - name: LLM Test (Skip - See Nightly)
         run: |
-          echo "📝 Prompt 品質驗證..."
-          uv run pytest tests/test_prompt_validation.py::test_prompt_quality_report -v --tb=short || echo "⚠️ Prompt 驗證略過"
+          echo "⏭️ LLM 測試已移至 Nightly workflow"
+          echo "   - test_model_regression.py"
+          echo "   - test_prompt_validation.py"
+          echo "   原因: CPU 推理 ~300s/測試"
 
   # ==================== OpenAPI Validation ====================
   openapi-validate:
diff --git a/apps/api/src/core/__init__.py b/apps/api/src/core/__init__.py
index 3e83c630..f65d6356 100644
--- a/apps/api/src/core/__init__.py
+++ b/apps/api/src/core/__init__.py
@@ -1 +1,30 @@
 # Core module
+# ADR-027: Incident-Approval 同步架構 (2026-03-26)
+
+from .constants import (
+    APPROVAL_TO_INCIDENT_STATUS,
+    APPROVAL_TTL_SECONDS,
+    DECISION_TTL_SECONDS,
+    INCIDENT_ACTIVE_STATUSES,
+    INCIDENT_TTL_SECONDS,
+    REDIS_KEY_APPROVAL,
+    REDIS_KEY_DECISION,
+    REDIS_KEY_INCIDENT,
+    REDIS_KEY_PENDING,
+)
+from .unit_of_work import UnitOfWork
+
+__all__ = [
+    # Constants (ADR-027)
+    "INCIDENT_TTL_SECONDS",
+    "APPROVAL_TTL_SECONDS",
+    "DECISION_TTL_SECONDS",
+    "REDIS_KEY_INCIDENT",
+    "REDIS_KEY_APPROVAL",
+    "REDIS_KEY_PENDING",
+    "REDIS_KEY_DECISION",
+    "APPROVAL_TO_INCIDENT_STATUS",
+    "INCIDENT_ACTIVE_STATUSES",
+    # Unit of Work (ADR-027)
+    "UnitOfWork",
+]