chore(observability): add CSS mirror sync helper

docs/guides/observability_ui_governance.md

@@ -50,7 +50,13 @@ scripts/check_observability_suite.sh
 python3 scripts/check_observability_ui.py
 ```
 
-或透過既有 quick review 選單執行第 8 項完整 QA 套件、第 6 項靜態 UI guard：
+如果修改了 `static/css/observability-system.css`，先同步 Flask 實際服務用的 mirror：
+
+```bash
+python3 scripts/sync_observability_css.py
+```
+
+或透過既有 quick review 選單執行第 8 項完整 QA 套件、第 6 項靜態 UI guard、第 9 項 CSS mirror sync：
 
 ```bash
 ./scripts/quick_review.sh

scripts/check_observability_ui.py

@@ -202,7 +202,7 @@ def scan_css() -> list[str]:
         web_text = web_path.read_text(encoding="utf-8")
         if web_text != text:
             findings.append(
-                f"{WEB_CSS_PATH}: must match {CSS_PATH} so production /static CSS is in sync"
+                f"{WEB_CSS_PATH}: must match {CSS_PATH} so production /static CSS is in sync; run `python3 scripts/sync_observability_css.py`"
             )
 
     return findings

scripts/quick_review.sh

@@ -18,6 +18,7 @@ CODE_REVIEW_SCRIPT="$PROJECT_ROOT/scripts/code_review.py"
 OBSERVABILITY_UI_GUARD="$PROJECT_ROOT/scripts/check_observability_ui.py"
 OBSERVABILITY_PAGE_SMOKE="$PROJECT_ROOT/scripts/check_observability_pages.py"
 OBSERVABILITY_QA_SUITE="$PROJECT_ROOT/scripts/check_observability_suite.sh"
+OBSERVABILITY_CSS_SYNC="$PROJECT_ROOT/scripts/sync_observability_css.py"
 
 # 顯示標題
 echo -e "${BLUE}========================================${NC}"
@@ -75,6 +76,16 @@ run_observability_qa_suite() {
     bash "$OBSERVABILITY_QA_SUITE"
 }
 
+run_observability_css_sync() {
+    if [ ! -f "$OBSERVABILITY_CSS_SYNC" ]; then
+        echo -e "${RED}❌ AI觀測台 CSS 同步腳本不存在: $OBSERVABILITY_CSS_SYNC${NC}"
+        exit 1
+    fi
+
+    echo -e "${GREEN}🎨 同步 AI觀測台 CSS 到 Flask static path...${NC}"
+    python3 "$OBSERVABILITY_CSS_SYNC"
+}
+
 # 顯示選單
 if [ $# -eq 0 ]; then
     echo -e "${YELLOW}請選擇操作：${NC}"
@@ -86,8 +97,9 @@ if [ $# -eq 0 ]; then
     echo "6) AI觀測台 UI/UX 防回歸檢查"
     echo "7) AI觀測台 10頁線上巡檢"
     echo "8) AI觀測台完整 QA 套件"
+    echo "9) 同步 AI觀測台 CSS static mirror"
     echo ""
-    read -p "請輸入選項 (1-8): " choice
+    read -p "請輸入選項 (1-9): " choice
     
     case $choice in
         1)
@@ -126,6 +138,9 @@ if [ $# -eq 0 ]; then
         8)
             run_observability_qa_suite
             ;;
+        9)
+            run_observability_css_sync
+            ;;
         *)
             echo -e "${RED}❌ 無效選項${NC}"
             exit 1

scripts/sync_observability_css.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+"""Sync the canonical observability CSS to the Flask-served static path.
+
+The project keeps the design-system source at:
+  static/css/observability-system.css
+
+Production Flask static serving currently exposes:
+  web/static/css/observability-system.css
+
+This helper keeps the two files byte-identical so deploys do not regress into
+"HTML links the CSS but /static/css/observability-system.css is 404/stale".
+"""
+
+from __future__ import annotations
+
+import shutil
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+SOURCE = ROOT / "static/css/observability-system.css"
+TARGET = ROOT / "web/static/css/observability-system.css"
+
+
+def main() -> int:
+    if not SOURCE.exists():
+        print(f"ERROR: missing source CSS: {SOURCE.relative_to(ROOT)}")
+        return 1
+
+    TARGET.parent.mkdir(parents=True, exist_ok=True)
+    source_bytes = SOURCE.read_bytes()
+    target_bytes = TARGET.read_bytes() if TARGET.exists() else b""
+
+    if source_bytes == target_bytes:
+        print("Observability CSS sync: already in sync")
+        print(f"- source: {SOURCE.relative_to(ROOT)}")
+        print(f"- target: {TARGET.relative_to(ROOT)}")
+        return 0
+
+    shutil.copyfile(SOURCE, TARGET)
+    print("Observability CSS sync: synced")
+    print(f"- source: {SOURCE.relative_to(ROOT)}")
+    print(f"- target: {TARGET.relative_to(ROOT)}")
+    print(f"- bytes: {len(source_bytes)}")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())