Fix #279: add defusedxml to uv.lock so Docker image installs it (#282)

defusedxml is listed in backend/pyproject.toml line 18 but was missing
from uv.lock. The backend Dockerfile uses `uv sync --frozen --no-dev`,
which only installs packages pinned in the lockfile. As a result the
runtime image shipped without defusedxml even though pyproject declared
it, and any import path that touched it crashed at startup with:

    ModuleNotFoundError: No module named 'defusedxml'

Affected import sites:

- backend/services/psk_reporter_fetcher.py:10
- backend/services/fetchers/aircraft_database.py:21
- backend/services/cctv_pipeline.py:990
- backend/services/cctv_pipeline.py:1018

Fix: regenerate uv.lock so defusedxml v0.7.1 (matching the >=0.7.1
specifier in pyproject) is locked. No code changes -- only the lockfile.
Next image build picks it up via the existing `uv sync --frozen` step.

Reporter: external user. Thanks for catching the missing dep.

uv.lock

@@ -82,6 +82,7 @@ dependencies = [
     { name = "cachetools" },
     { name = "cloudscraper" },
     { name = "cryptography" },
+    { name = "defusedxml" },
     { name = "fastapi" },
     { name = "feedparser" },
     { name = "httpx" },
@@ -120,6 +121,7 @@ requires-dist = [
     { name = "cachetools", specifier = "==5.5.2" },
     { name = "cloudscraper", specifier = "==1.2.71" },
     { name = "cryptography", specifier = ">=41.0.0" },
+    { name = "defusedxml", specifier = ">=0.7.1" },
     { name = "fastapi", specifier = "==0.115.12" },
     { name = "feedparser", specifier = "==6.0.10" },
     { name = "httpx", specifier = "==0.28.1" },
@@ -600,6 +602,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/a4/87/d03a718e7bfdbbebaa4b6a66ba5bb069bc00a84e5ad176d8198cc785cd42/dbus_fast-4.0.0-cp314-cp314t-musllinux_1_2_x86_64.whl", hash = "sha256:f6af190d8306f1bd506740c39701f5c211aa31ac660a3fcb401ebb97d33166c7", size = 1627620, upload-time = "2026-02-01T21:05:46.878Z" },
 ]
 
+[[package]]
+name = "defusedxml"
+version = "0.7.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/0f/d5/c66da9b79e5bdb124974bfe172b4daf3c984ebd9c2a06e2b8a4dc7331c72/defusedxml-0.7.1.tar.gz", hash = "sha256:1bb3032db185915b62d7c6209c5a8792be6a32ab2fedacc84e01b52c51aa3e69", size = 75520, upload-time = "2021-03-08T10:59:26.269Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/07/6c/aa3f2f849e01cb6a001cd8554a88d4c77c5c1a31c95bdf1cf9301e6d9ef4/defusedxml-0.7.1-py2.py3-none-any.whl", hash = "sha256:a352e7e428770286cc899e2542b6cdaedb2b4953ff269a210103ec58f6198a61", size = 25604, upload-time = "2021-03-08T10:59:24.45Z" },
+]
+
 [[package]]
 name = "deprecated"
 version = "1.3.1"