refactor(scripts): extract shared utilities into common module

- Move load_env_file, parse_timeout_seconds, build_remote_script, and
  build_ssh_command to scripts/common.py
- Update remote_docker_run.py to import from common module
- Improves code organization and reusability

.safety-net.json

@@ -18,7 +18,13 @@
         "-h",
         "-v"
       ],
-      "reason": "uv run is blocked in this project. Use direct command execution instead."
+      "reason": "Local Environment is not avaiable. Please use \"just remote <cmd>\" to run commands in the remote docker. And remember to run \"just upload\" before run commands in the remote docker."
+    },
+    {
+      "name": "block-uv-sync",
+      "command": "uv",
+      "block_args": ["sync"],
+      "reason": "The project is managed by micromamba and uv. Do not sync packages directly by uv. Use \"just sync-pkgs\" or \"uv sync --inexact\" instead."
     }
   ]
 }