Fix: Use Gemini Flash as default, fix unavailable HF models

- Made Gemini 2.5 Flash the default free model
- Removed unavailable models (Qwen3-VL-235B, DeepSeek-V3.1)
- Updated to use DeepSeek-R1 which is available on Novita
- Reordered model lists for better UX

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app.py

@@ -94,13 +94,12 @@ def extract_pdf_pages(pdf_paths, pdf_name_map, mode="image"):
 
 # Free models - display name -> actual API model name
 FREE_MODELS_MAP = {
-    "Qwen3 235B": "Qwen/Qwen3-VL-235B-A22B-Instruct:novita",
-    "DeepSeek V3.1": "deepseek-ai/DeepSeek-V3.1:novita",
-    "Llama 3.3 70B": "meta-llama/Llama-3.3-70B-Instruct:groq",
     "Gemini 2.5 Flash": "gemini-2.5-flash",
     "GPT-4o Mini": "gpt-4o-mini",
-    "Mistral Medium": "mistral-medium-2505",
     "Claude 3 Haiku": "claude-3-haiku-20240307",
+    "Llama 3.3 70B": "meta-llama/Llama-3.3-70B-Instruct:groq",
+    "DeepSeek R1": "deepseek-ai/DeepSeek-R1:novita",
+    "Mistral Medium": "mistral-medium-2505",
     "Grok 4 Fast": "grok-4-fast-non-reasoning",
 }
 FREE_MODEL_DISPLAY_NAMES = list(FREE_MODELS_MAP.keys())
@@ -108,22 +107,21 @@ FREE_MODEL_CHOICES = list(FREE_MODELS_MAP.values())  # Keep for backward compat
 
 # Paid models (user provides their own API key)
 PAID_MODEL_CHOICES = [
+    "gemini-2.5-flash",
+    "gemini-2.5-pro",
     "gpt-4.1",
     "gpt-4o",
     "gpt-4o-mini",
     "claude-sonnet-4-5-20250929",
     "claude-opus-4-20250514",
     "claude-3-5-haiku-20241022",
-    "gemini-2.5-pro",
-    "gemini-2.5-flash",
     "mistral-large-latest",
 ]
 
 # Models routed through HuggingFace
 HF_ROUTED_MODELS = [
-    "Qwen/Qwen3-VL-235B-A22B-Instruct:novita",
-    "deepseek-ai/DeepSeek-V3.1:novita",
     "meta-llama/Llama-3.3-70B-Instruct:groq",
+    "deepseek-ai/DeepSeek-R1:novita",
 ]