Upgrade Relay to v20.1.1 and unify compiler config

Consolidate the two per-app relay configs (console and trust)
into a single multi-project relay.config.json at the repo root
with three projects: core, iam, and trust. Bump all relay
packages from v19 to v20.1.1 and move relay-compiler to the
root devDependencies. Replace per-workspace relay scripts with
a single root-level npm run relay command and update the
GNUmakefile, CI workflows, and docs accordingly.

Signed-off-by: Émile Ré <emile@getprobo.com>

apps/console/package.json

@@ -5,9 +5,6 @@
   "type": "module",
   "scripts": {
     "dev": "vite --port 5173",
-    "relay-clean": "find src -type d -name \"__generated__\" -exec rm -rf {} +",
-    "relay-compile": "npx relay-compiler",
-    "relay": "npm run relay-clean && npm run relay-compile",
     "build": "tsc -b && vite build",
     "lint": "eslint . --concurrency 4",
     "check": "tsc --noEmit -p tsconfig.app.json",
@@ -33,9 +30,9 @@
     "react-error-boundary": "^6.0.0",
     "react-hook-form": "^7.56.4",
     "react-pdf": "^10.3.0",
-    "react-relay": "^19.0.0",
+    "react-relay": "^20.1.1",
     "react-router": "^7.12.0",
-    "relay-runtime": "^19.0.0",
+    "relay-runtime": "^20.1.1",
     "use-debounce": "^10.0.5",
     "usehooks-ts": "^3.1.1",
     "zod": "^3.25.17"
@@ -48,12 +45,11 @@
     "@types/react": "^19.1.2",
     "@types/react-dom": "^19.1.2",
     "@types/react-relay": "^18.2.1",
-    "@types/relay-runtime": "^19.0.1",
+    "@types/relay-runtime": "^20.1.1",
     "@vitejs/plugin-react": "^5.1.4",
-    "babel-plugin-relay": "^19.0.0",
+    "babel-plugin-relay": "^20.1.1",
     "eslint": "^9.39.2",
     "graphql": "^16.11.0",
-    "relay-compiler": "^19.0.0",
     "tailwindcss": "^4.1.7",
     "typescript": "~5.8.3",
     "vite": "^7.3.2"