Revert the self-hosted deploy fix

Restores the tree to 3b16d50, reverting:

  3c649fc  Fix blank page on self-hosted deploys

The earlier public-route commits were already reverted by 0ddbd35 and a51ab4a,
so this returns the working tree exactly to the state at 3b16d50.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

nginx.conf

@@ -49,29 +49,12 @@ http {
         root  /usr/share/nginx/html;
         index index.html;
 
-        # Container liveness for Dokploy/Docker. Kept above the SPA fallback so it
-        # answers with a real status instead of 200-plus-index.html, which would
-        # make any health check pass even with the app completely broken.
-        location = /health {
-            access_log off;
-            add_header Content-Type text/plain;
-            return 200 "ok\n";
-        }
-
         # Vite writes content-hashed filenames here, so they can be cached forever.
         # Only add_header is used — combining it with `expires` emits two
         # conflicting Cache-Control headers.
-        #
-        # try_files ending in =404 is deliberate: without it a stale index.html
-        # asking for an asset from a previous deploy would fall through to the
-        # SPA rule below and receive index.html with a 200 and a text/html type.
-        # The browser refuses to execute that as a module and the page renders
-        # empty with only a MIME error in the console — a real 404 is far easier
-        # to diagnose and lets a reload recover.
         location /assets/ {
             add_header Cache-Control "public, max-age=31536000, immutable";
             access_log off;
-            try_files $uri =404;
         }
 
         # index.html must be revalidated every time or deploys won't take effect
@@ -82,11 +65,6 @@ http {
         location / {
             # This line forces Nginx to pass routing back to React Router
             try_files $uri $uri/ /index.html;
-
-            # The fallback is served under the requested path, so the `= /index.html`
-            # rule above never applies to it. Without this a proxy or browser can
-            # cache the old HTML and keep loading assets that no longer exist.
-            add_header Cache-Control "no-cache";
         }
     }
 }