Pin camera sources by parsed URL

Camera catalog image URLs were pinned by string prefix, so a URL that only
began with the agency's directory before dot segments or an encoded separator
were resolved still counted as inside it. The pin now parses the URL and
requires the same scheme, the exact host, no credentials, the default port and
a normalized path inside the pinned directory. Redirects on a pinned host must
stay inside the same directory.

Document the response format checks and API response headers alongside the
existing server hardening notes.

scripts/format-scope.json

@@ -121,6 +121,7 @@
   "server/providers/cctv/normalize.js",
   "src/data/cctvMissingNumbers.test.mjs",
   "server/providers/cctv/sources.js",
+  "src/data/cctvSourcePins.test.mjs",
   "server/providers/radio.js",
   "server/providers/radio/catalog.js",
   "server/providers/radio/constants.js",