fix(avatar): prevent stale deployment images

digital-avatar-app/backend/Dockerfile

@@ -1,5 +1,12 @@
 FROM python:3.10-slim
 
+ARG APP_GIT_SHA=unknown
+ARG APP_BUILD_TIME=unknown
+ENV APP_GIT_SHA=${APP_GIT_SHA} \
+    APP_BUILD_TIME=${APP_BUILD_TIME}
+LABEL org.opencontainers.image.revision=${APP_GIT_SHA} \
+      org.opencontainers.image.created=${APP_BUILD_TIME}
+
 WORKDIR /app
 
 # 后端依赖（fastapi/uvicorn/sqlalchemy/pypdf/python-docx/openpyxl 等）均为纯 Python wheel，

digital-avatar-app/backend/main.py

@@ -1,13 +1,14 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-import os
+import importlib.util
 import logging
+import os
 
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from apscheduler.triggers.interval import IntervalTrigger
 
-from database import init_db, SessionLocal
+from database import engine, init_db, SessionLocal
 from models import Avatar, Authorization, Organization, TokenAccount, TokenPlan, User
 from fastapi.staticfiles import StaticFiles
 import routers.avatars
@@ -54,7 +55,31 @@ app.mount("/api/files", StaticFiles(directory=UPLOAD_DIR), name="knowledge-files
 
 @app.get("/api/health")
 def health():
-    return ok({"status": "ok"})
+    checks = _runtime_checks()
+    return ok({
+        "status": "ok" if all(checks.values()) else "degraded",
+        "gitSha": os.getenv("APP_GIT_SHA", "unknown"),
+        "buildTime": os.getenv("APP_BUILD_TIME", "unknown"),
+        "checks": checks,
+    })
+
+
+def _runtime_checks():
+    return {
+        "database": _database_is_ready(),
+        "uploads": os.path.isdir(UPLOAD_DIR) and os.access(UPLOAD_DIR, os.W_OK),
+        "pdfOcr": importlib.util.find_spec("pymupdf") is not None,
+    }
+
+
+def _database_is_ready():
+    try:
+        with engine.connect() as connection:
+            connection.exec_driver_sql("SELECT 1")
+        return True
+    except Exception:
+        logger.exception("Database readiness check failed")
+        return False
 
 
 def seed():

digital-avatar-app/backend/tests/test_health.py

@@ -0,0 +1,33 @@
+import main
+
+
+def test_health_reports_release_and_runtime_capabilities(monkeypatch):
+    monkeypatch.setenv("APP_GIT_SHA", "test-sha")
+    monkeypatch.setenv("APP_BUILD_TIME", "2026-09-09T00:00:00Z")
+    monkeypatch.setattr(main, "_runtime_checks", lambda: {
+        "database": True,
+        "uploads": True,
+        "pdfOcr": True,
+    })
+
+    response = main.health()
+
+    assert response["code"] == 200
+    assert response["data"]["status"] == "ok"
+    assert response["data"]["gitSha"] == "test-sha"
+    assert response["data"]["buildTime"] == "2026-09-09T00:00:00Z"
+    assert response["data"]["checks"] == {
+        "database": True,
+        "uploads": True,
+        "pdfOcr": True,
+    }
+
+
+def test_health_is_degraded_when_a_required_capability_is_missing(monkeypatch):
+    monkeypatch.setattr(main, "_runtime_checks", lambda: {
+        "database": True,
+        "uploads": True,
+        "pdfOcr": False,
+    })
+
+    assert main.health()["data"]["status"] == "degraded"