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.

scripts/cf-purge.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# Purge the Cloudflare edge cache for one or more Cache-Tags.
+#
+# These tags are emitted by nginx (deployment/proxy/nginx-cms.conf):
+#   cms-public   - de publieke API-allowlist (staff/teams/guilds/shop/values/…)
+#   cms-gamedata - /gamedata/ (furnidata, config)
+#   cms-client   - /client/ + /nitro-client/ (game assets)
+#   cms-camera   - /camera/
+#
+# Usage:
+#   scripts/cf-purge.sh cms-public
+#   scripts/cf-purge.sh cms-public cms-gamedata cms-client cms-camera
+#
+# Reads CLOUDFLARE_API_TOKEN / CLOUDFLARE_ZONE_ID from the environment or the
+# repository .env. Fails loudly with a clear message when they are missing or
+# still placeholders, so a pipeline either purges or aborts — never silently
+# pretends it did.
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ENV_FILE="$SCRIPT_DIR/../.env"
+BASE="https://api.cloudflare.com/client/v4"
+
+[[ $# -ge 1 ]] || { echo "usage: $0 <tag> [tag ...]" >&2; exit 64; }
+TAGS=("$@")
+
+load_env() {
+  local name="$1"
+  if [[ -n "${!name:-}" ]]; then
+    printf -v "$name" '%s' "${!name}"
+    return 0
+  fi
+  if [[ -f "$ENV_FILE" ]]; then
+    local line
+    line="$(grep -m1 "^$name=" "$ENV_FILE" | cut -d= -f2- | tr -d "'\"")" || true
+    if [[ -n "$line" ]]; then
+      printf -v "$name" '%s' "$line"
+      return 0
+    fi
+  fi
+  return 1
+}
+
+load_env CLOUDFLARE_API_TOKEN || { echo "error: CLOUDFLARE_API_TOKEN not configured" >&2; exit 1; }
+load_env CLOUDFLARE_ZONE_ID || { echo "error: CLOUDFLARE_ZONE_ID not configured" >&2; exit 1; }
+
+# Placeholder guard: the repo .env historically carried 2-char dummy values.
+if [[ "${#CLOUDFLARE_API_TOKEN}" -lt 16 || "${#CLOUDFLARE_ZONE_ID}" -lt 16 ]]; then
+  echo "error: Cloudflare credentials look like placeholders; add a real token to .env" >&2
+  exit 1
+fi
+
+body="$(python3 -c 'import json,sys; print(json.dumps({"tags": sys.argv[1:]}))' "${TAGS[@]}")"
+
+resp="$(curl -sS -m 20 -X POST \
+  -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
+  -H "Content-Type: application/json" \
+  --data "$body" \
+  "$BASE/zones/$CLOUDFLARE_ZONE_ID/purge_cache")"
+
+if ! python3 -c 'import json,sys; sys.exit(0 if json.load(sys.stdin).get("success") else 1)' <<<"$resp"; then
+  echo "error: Cloudflare purge failed: $resp" >&2
+  exit 1
+fi
+echo "purged tags: ${TAGS[*]}"