Support HTTPS deployment under /generadorexamenesllm behind reverse proxy.

This updates frontend base-path routing, same-origin API proxying, and deployment defaults/docs so the app works correctly through the Sinbad2 Apache ProxyPass setup.

backend/.env.example

@@ -9,7 +9,7 @@ API_KEY=change-me-in-production-min-16-chars
 DATABASE_URL=postgresql+psycopg://genexamenes:genexamenes@db:5432/genexamenes
 
 # --- CORS (orígenes del frontend, separados por coma) ---
-ALLOWED_ORIGINS=http://sinbad2.ujaen.es,http://sinbad2.ujaen.es:8075
+ALLOWED_ORIGINS=https://sinbad2.ujaen.es,http://sinbad2.ujaen.es,http://sinbad2.ujaen.es:8075
 
 # --- Rate limiting y tamaño de petición ---
 RATE_LIMIT_REQUESTS=60

backend/app/core/config.py

@@ -10,7 +10,7 @@ class Settings(BaseSettings):
     api_prefix: str = ""
     api_key: str = Field(min_length=16)
     database_url: str = "postgresql+psycopg://genexamenes:genexamenes@localhost:5432/genexamenes"
-    allowed_origins: str = "http://sinbad2.ujaen.es,http://sinbad2.ujaen.es:8075"
+    allowed_origins: str = "https://sinbad2.ujaen.es,http://sinbad2.ujaen.es,http://sinbad2.ujaen.es:8075"
     rate_limit_requests: int = Field(default=60, ge=1)
     rate_limit_window_seconds: int = Field(default=60, ge=1)
     max_request_bytes: int = Field(default=1_048_576, ge=1_024)