fix(atlas): gzip-compress responses so large country GeoJSON loads behind reverse proxies (#1262)

The admin-0 country GeoJSON served at /api/addons/atlas/countries/geo is
~30 MB uncompressed. With no compression in the request pipeline the
transfer aborts (~8s, net::ERR_FAILED despite a 200) behind reverse
proxies / Cloudflare Tunnel, so the Atlas map never colours visited
countries. LAN is unaffected.

Add the `compression` middleware to the shared applyGlobalMiddleware
pipeline (gzip brings ~30 MB down to ~4 MB). text/event-stream is
excluded so the /mcp StreamableHTTP (SSE) transport is not buffered.

Adds BOOT-008 asserting content-encoding: gzip on the geo endpoint.

Fixes #1254

Co-authored-by: pai <pai@stabpablo.eu>

server/package.json

@@ -30,6 +30,7 @@
     "archiver": "^6.0.1",
     "bcryptjs": "^2.4.3",
     "better-sqlite3": "^12.8.0",
+    "compression": "^1.8.0",
     "cookie-parser": "^1.4.7",
     "cors": "^2.8.5",
     "dotenv": "^16.4.1",
@@ -72,6 +73,7 @@
     "@types/archiver": "^7.0.0",
     "@types/bcryptjs": "^2.4.6",
     "@types/better-sqlite3": "^7.6.13",
+    "@types/compression": "^1.8.0",
     "@types/cookie-parser": "^1.4.10",
     "@types/cors": "^2.8.19",
     "@types/express": "^4.17.25",