feat(cache): single-owner caching across nginx, edge and content edits

Rebuild production nginx from the repo (deployment/proxy/*) with a single
Cache-Control owner per route: the app stays the source, nginx only manages
headers, and Cloudflare stores the public API allowlist at the edge.

- deployment/proxy: nginx.conf, mime.types, nginx-cms.conf and the
  blue/green upstream snippet; config backed by scripts/nginx-sync.sh
  (idempotent install + reload, --check/--force).
- nginx serves Cache-Tag headers on the public allowlist (cms-public),
  gamedata, client and camera responses so the edge and purge stay in sync.
- src/lib/edge-cache.ts + tests: coalesced, fire-and-forget edge purges that
  no-op unless Cloudflare is configured; scripts/cf-purge.sh and
  cf-setup-cache.sh create and purge the cache rule.
- src/lib/cloudflare-api.ts: purgeCacheByTags/purgeCacheByUrls.
- Purge hooks after catalog exports (public + gamedata) and on shop, team,
  guild, photo and rare-values edits; ci-deploy purges after each release.
- src/proxy.ts excludes the imaging/images docs from the middleware matcher.

deployment/proxy/nginx-mime.types

@@ -0,0 +1,34 @@
+types {
+    text/html html htm shtml;
+    text/css css;
+    text/xml xml;
+    text/plain txt;
+    application/javascript js mjs;
+    application/json json map;
+    application/ld+json jsonld;
+    application/rss+xml rss;
+    application/wasm wasm;
+    application/xml xsd xsl;
+    font/ttf ttf;
+    font/otf otf;
+    font/woff woff;
+    font/woff2 woff2;
+    image/svg+xml svg svgz;
+    image/bmp bmp;
+    image/gif gif;
+    image/jpeg jpeg jpg;
+    image/png png;
+    image/webp webp;
+    image/avif avif;
+    image/x-icon ico cur;
+    video/mp4 mp4 m4v;
+    video/webm webm;
+    audio/mpeg mp3;
+    audio/ogg ogg;
+    audio/wav wav;
+    application/octet-stream dat bin swf;
+    application/zip zip;
+    application/gzip gz;
+    application/pdf pdf;
+    application/vnd.apple.mpegurl m3u8;
+}