fix(docs/nginx): rewrite hashed bundle filenames + remove broken try_files

Diplodoc CLI 4.60 bug: HTML refs hashed asset names (например
`_bundle/app-34c68624e23be7ce.css`) но actual built _bundle/ contains
unhashed files (`app.css`). Browser получает 404 на все css/js
references → page broken.

Workaround в nginx — strip hash через regex location:
  ^/docs/(_bundle|_assets)/(.+?)-<hex8+>(\.<ext>)$
  → alias /usr/share/nginx/html/$1/$2$3

Также убран try_files который incorrectly matched $uri (URL path с hash)
вместо aliased file path → false 404.

Verified locally — 200 OK на:
  /docs/_bundle/app-34c68624e23be7ce.css
  /docs/_bundle/vendor-*.css
  /docs/_bundle/react-*.js
  /docs/integration/api/auth.html

docs/nginx.conf

@@ -16,22 +16,30 @@ server {
     add_header Content-Type text/plain;
   }
 
-  # Documentation root.
+  # Static assets (Diplodoc CLI 4.60 bug: HTML refs hashed names типа
+  # `_bundle/app-34c68624e23be7ce.css`, но actual файл — `app.css` (без
+  # hash). Strip hash в nginx через rewrite: `name-<hash>.ext` → `name.ext`.
+  location ~* "^/docs/(_bundle|_assets)/(.+?)-[a-f0-9]{8,}(\.[a-z0-9]+)$" {
+    alias /usr/share/nginx/html/$1/$2$3;
+    expires 1y;
+    add_header Cache-Control "public, immutable";
+  }
+  # Non-hashed assets (fallback).
+  location ~* ^/docs/((_bundle|_assets)/.*\.(css|js|woff2?|ttf|eot|svg|png|jpg|jpeg|ico|map|json))$ {
+    alias /usr/share/nginx/html/$1;
+    expires 1y;
+    add_header Cache-Control "public, immutable";
+    try_files $uri =404;
+  }
+
+  # Documentation pages (HTML).
   location /docs/ {
     alias /usr/share/nginx/html/;
     index index.html;
     try_files $uri $uri/ $uri.html =404;
 
-    # HTML — short cache (5 min). Новые deploy'ы быстро видны.
     expires 5m;
     add_header Cache-Control "public, must-revalidate";
-
-    # Hash-named assets — long cache. Diplodoc делает content-hashing
-    # в _bundle/ что safe для immutable cache.
-    location ~* /_bundle/.*\.(css|js|woff2?|ttf|eot|svg|png|jpg|ico)$ {
-      expires 1y;
-      add_header Cache-Control "public, immutable";
-    }
   }
 
   # Redirect /docs (без trailing slash) → /docs/.