Rebrand: RealityCheck AI -> ConceptVector across all files

main.py

@@ -94,7 +94,7 @@ class AnalysisResponse(BaseModel):
 async def root():
     """Health check endpoint"""
     return {
-        "message": "RealityCheck AI API",
+        "message": "ConceptVector API",
         "status": "operational",
         "version": "1.0.0"
     }