Fix requirements: add pandas>=2.0, set gradio>=6.0.0 consistently

- Add pandas>=2.0 to requirements.txt (used by app.py)
- Update pyproject.toml from gradio>=5.0.0 to gradio>=6.0.0
- Add pandas>=2.0 to pyproject.toml dependencies

pyproject.toml

@@ -10,9 +10,10 @@ dependencies = [
     "fastmcp>=2.14.5",
     "fastapi>=0.115.0",
     "uvicorn>=0.24.0",
-    "gradio>=5.0.0",
+    "gradio>=6.0.0",
     "pydantic>=2.0",
     "httpx>=0.27",
+    "pandas>=2.0",
 ]
 
 [project.optional-dependencies]

requirements.txt

@@ -4,3 +4,4 @@ fastmcp>=2.14.5
 pydantic>=2.0
 mcp>=1.26.0
 httpx>=0.27
+pandas>=2.0