fix force_ssl compile-time config mismatch

force_ssl must be set at compile time (in prod.exs), not runtime.
Phoenix validates compile-time config at boot and was crashing
because the value differed between compile and runtime.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

config/runtime.exs

@@ -64,9 +64,7 @@ if config_env() == :prod do
       ip: {0, 0, 0, 0, 0, 0, 0, 0},
       port: port
     ],
-    secret_key_base: secret_key_base,
-    # HSTS tells browsers to always use HTTPS for this domain (1 year, include subdomains)
-    force_ssl: [hsts: true, rewrite_on: [:x_forwarded_proto]]
+    secret_key_base: secret_key_base
 
   # ## SSL Support
   #