fix(ui): clarify mode compatibility in radio button info

Old: "⚡ Simple: Fast (Free/Any Key) | 🔬 Advanced: Deep Multi-Agent (OpenAI Key Only)"
New: "⚡ Simple: Free/OpenAI/Anthropic | 🔬 Advanced: OpenAI only"

Explicitly lists all supported backends for Simple mode so Anthropic
users know they're not locked out.

src/app.py

@@ -225,10 +225,7 @@ def create_demo() -> tuple[gr.ChatInterface, gr.Accordion]:
                 choices=["simple", "advanced"],
                 value="simple",
                 label="Orchestrator Mode",
-                info=(
-                    "⚡ Simple: Fast (Free/Any Key) | "
-                    "🔬 Advanced: Deep Multi-Agent (OpenAI Key Only)"
-                ),
+                info="⚡ Simple: Free/OpenAI/Anthropic | 🔬 Advanced: OpenAI only",
             ),
             gr.Textbox(
                 label="🔑 API Key (Optional)",

tests/unit/test_ui_elements.py

@@ -24,9 +24,7 @@ def test_orchestrator_mode_info_text_updated():
     demo, _ = create_demo()
     # Assuming additional_inputs is a list and the Radio is the first element
     orchestrator_radio = demo.additional_inputs[0]
-    expected_info = (
-        "⚡ Simple: Fast (Free/Any Key) | " "🔬 Advanced: Deep Multi-Agent " "(OpenAI Key Only)"
-    )
+    expected_info = "⚡ Simple: Free/OpenAI/Anthropic | 🔬 Advanced: OpenAI only"
     assert isinstance(
         orchestrator_radio, gr.Radio
     ), "Expected first additional input to be gr.Radio"