perf: 프로필 공용 정적 자산 경로를 제공한다

Caddy가 commit-digest 공용 asset과 sourcemap을 immutable URL로 제공하고, runtime에 공용 공개 경로를 명시한다.

test/caddy-cache-policy.test.mjs

@@ -24,6 +24,26 @@ test('Caddy caches only content-hashed Vite frontend assets as immutable', async
     caddyfile,
     /header @immutableFrontendAssets >Cache-Control "public, max-age=31536000, immutable"/,
   );
+
+  const sharedMatcher = caddyfile.match(
+    /@immutableSharedProfileAssets path_regexp immutableSharedProfileAssets (\S+)/,
+  );
+  assert.ok(sharedMatcher, 'immutable shared profile asset matcher must exist');
+  const sharedAssetPath = new RegExp(sharedMatcher[1]);
+  const releaseId = `${'a'.repeat(40)}-${'b'.repeat(16)}`;
+  assert.equal(
+    sharedAssetPath.test(`/gateway/profile-assets/${releaseId}/assets/index-CcXtLSVk.js`),
+    true,
+  );
+  assert.equal(
+    sharedAssetPath.test(`/gateway/profile-assets/${releaseId}/assets/index-CcXtLSVk.js.map`),
+    true,
+  );
+  assert.equal(sharedAssetPath.test(`/gateway/profile-assets/${releaseId}/index.html`), false);
+  assert.match(
+    caddyfile,
+    /header @immutableSharedProfileAssets >Cache-Control "public, max-age=31536000, immutable"/,
+  );
 });
 
 test('Caddy serves published frontend artifacts directly and keeps a transition fallback', async () => {
@@ -47,4 +67,10 @@ test('Caddy serves published frontend artifacts directly and keeps a transition
   }
   assert.match(caddyfile, /try_files \{path\} \/index\.html/);
   assert.match(caddyfile, /header @frontendRequests Cache-Control "no-cache"/);
+  assert.match(
+    caddyfile,
+    /@sharedProfileAsset path_regexp sharedProfileAsset \^\/gateway\/profile-assets\//,
+  );
+  assert.match(caddyfile, /root \* \/srv\/frontend-artifacts\/game-assets\/releases/);
+  assert.match(caddyfile, /uri strip_prefix \/gateway\/profile-assets/);
 });