Add self-hosting capabilities and deployment guide for the application

Implement self-hosting for RockyLinux by adding systemd and Nginx configurations, updating API models to support standard OpenAI keys, and providing a comprehensive deployment guide.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 923ae0e3-a363-4db8-b04a-e8baca2a1330
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: f8aa455f-f180-4964-94dd-11cfb1a42383
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8af7d2ec-2cc3-4ece-8af3-9f071488d072/923ae0e3-a363-4db8-b04a-e8baca2a1330/VnHW0bR
Replit-Helium-Checkpoint-Created: true

artifacts/flask-api/ai_agent.py

@@ -14,16 +14,31 @@ _client: OpenAI | None = None
 
 
 def get_client() -> OpenAI:
+    """
+    Supporte deux modes :
+    - Replit AI Integration : AI_INTEGRATIONS_OPENAI_BASE_URL + AI_INTEGRATIONS_OPENAI_API_KEY
+    - Auto-hébergement standard : OPENAI_API_KEY (+ OPENAI_BASE_URL optionnel pour proxy)
+    """
     global _client
     if _client is None:
-        base_url = os.environ.get("AI_INTEGRATIONS_OPENAI_BASE_URL")
-        api_key = os.environ.get("AI_INTEGRATIONS_OPENAI_API_KEY")
-        if not base_url or not api_key:
+        replit_base = os.environ.get("AI_INTEGRATIONS_OPENAI_BASE_URL")
+        replit_key  = os.environ.get("AI_INTEGRATIONS_OPENAI_API_KEY")
+        std_key     = os.environ.get("OPENAI_API_KEY")
+        std_base    = os.environ.get("OPENAI_BASE_URL")
+
+        if replit_base and replit_key:
+            _client = OpenAI(base_url=replit_base, api_key=replit_key)
+        elif std_key:
+            kwargs = {"api_key": std_key}
+            if std_base:
+                kwargs["base_url"] = std_base
+            _client = OpenAI(**kwargs)
+        else:
             raise RuntimeError(
-                "AI_INTEGRATIONS_OPENAI_BASE_URL et AI_INTEGRATIONS_OPENAI_API_KEY "
-                "sont requis. Configurez les intégrations Replit AI."
+                "Aucune clé IA configurée. "
+                "Définissez OPENAI_API_KEY dans le fichier .env "
+                "ou configurez les intégrations Replit AI."
             )
-        _client = OpenAI(base_url=base_url, api_key=api_key)
     return _client
 
 
@@ -34,8 +49,9 @@ def filter_idea(content: str) -> dict:
     """
     try:
         client = get_client()
+        filter_model = os.environ.get("OPENAI_FILTER_MODEL", "gpt-4o-mini")
         response = client.chat.completions.create(
-            model="gpt-5-mini",
+            model=filter_model,
             max_completion_tokens=300,
             response_format={"type": "json_object"},
             messages=[
@@ -96,9 +112,10 @@ def synthesize_ideas(ideas: list[str]) -> str:
         )
     try:
         client = get_client()
+        synthesis_model = os.environ.get("OPENAI_SYNTHESIS_MODEL", "gpt-4o")
         ideas_text = "\n".join(f"{i + 1}. {idea}" for i, idea in enumerate(ideas))
         response = client.chat.completions.create(
-            model="gpt-5.2",
+            model=synthesis_model,
             max_completion_tokens=1200,
             messages=[
                 {"role": "system", "content": SYNTHESIS_PROMPT},