fix: configure gitea webhook auto-deploy and fix provisioning NVS flash

- Add deploy-host.sh script for webhook-triggered docker redeploy
- Mark deploy-host.sh executable in .gitignore / git config
- Update docker-compose.yml and nginx.conf for auto-pull setup
- Fix vite.config.js and admin router for deployment environment
- Fix NVS generator CRC seed to match ESP-IDF esp_rom_crc32_le

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

backend/admin/router.py

@@ -42,23 +42,12 @@ async def deploy(request: Request):
 
     logger.info("Auto-deploy triggered via Gitea webhook")
 
-    project_path = settings.deploy_project_path
-    cmd = f"cd {project_path} && git pull origin main && docker compose up -d --build"
-    try:
-        proc = await asyncio.create_subprocess_shell(
-            cmd,
-            stdout=asyncio.subprocess.PIPE,
-            stderr=asyncio.subprocess.STDOUT,
-        )
-        stdout, _ = await asyncio.wait_for(proc.communicate(), timeout=300)
-        output = stdout.decode(errors="replace") if stdout else ""
+    # Write a trigger file to the host-mounted project path.
+    # A host-side watcher service (bellsystems-deploy-watcher) polls for this
+    # file and runs deploy-host.sh as the bellsystems user when it appears.
+    trigger_path = f"{settings.deploy_project_path}/.deploy-trigger"
+    with open(trigger_path, "w") as f:
+        f.write("deploy\n")
 
-        if proc.returncode != 0:
-            logger.error(f"Deploy failed (exit {proc.returncode}):\n{output}")
-            raise HTTPException(status_code=500, detail=f"Deploy script failed:\n{output[-500:]}")
-
-        logger.info(f"Deploy succeeded:\n{output[-300:]}")
-        return {"ok": True, "output": output[-1000:]}
-
-    except asyncio.TimeoutError:
-        raise HTTPException(status_code=504, detail="Deploy timed out after 300 seconds")
+    logger.info("Auto-deploy trigger file written")
+    return {"ok": True, "message": "Deploy started"}