dev: switch AI endpoint to localhost:3004 for testing

Temporarily point default AI endpoint to local dev server:
- Changed: https://osvm.ai → http://localhost:3004
- Enables: Real-time debugging of AI requests/responses
- Purpose: Test prompt improvements with full visibility

Note: This is a temporary dev change for testing.
Will revert to production endpoint before release.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: 0xrinegade

src/services/ai_service.rs

@@ -175,7 +175,7 @@ impl AiService {
                         (url, true)
                     } else {
                         eprintln!("⚠️  OpenAI URL provided but no OPENAI_KEY found, falling back to OSVM AI");
-                        ("https://osvm.ai/api/getAnswer".to_string(), false)
+                        ("http://localhost:3004/api/getAnswer".to_string(), false)
                     }
                 } else {
                     // Custom URL, treat as external API
@@ -189,7 +189,7 @@ impl AiService {
                 {
                     (url, true)
                 } else {
-                    ("https://osvm.ai/api/getAnswer".to_string(), false)
+                    ("http://localhost:3004/api/getAnswer".to_string(), false)
                 }
             }
         };