docs: update model references and add missing GPT-5 and Gemini 2.0 models

- Add missing models to all tool parameter documentation
- Update model table in advanced-usage.md with GPT-5 series
- Add Gemini 2.0 Flash and Flash Lite models
- Include detailed capabilities for each model variant
- Fix model parameter consistency across all tool docs

Models added:
- GPT-5 (gpt5): Advanced reasoning with 400K context
- GPT-5 Mini (gpt5-mini): Efficient variant
- GPT-5 Nano (gpt5-nano): Fast, low-cost variant
- Gemini 2.0 Flash (flash-2.0): Audio/video support
- Gemini 2.0 Flash Lite (flashlite): Text-only lightweight

docs/tools/refactor.md

@@ -103,7 +103,7 @@ This results in Claude first performing its own expert analysis, encouraging it
 **Initial Configuration (used in step 1):**
 - `prompt`: Description of refactoring goals, context, and specific areas of focus (required)
 - `refactor_type`: codesmells|decompose|modernize|organization (default: codesmells)
-- `model`: auto|pro|flash|o3|o3-mini|o4-mini|gpt4.1 (default: server default)
+- `model`: auto|pro|flash|flash-2.0|flashlite|o3|o3-mini|o4-mini|gpt4.1|gpt5|gpt5-mini|gpt5-nano (default: server default)
 - `focus_areas`: Specific areas to focus on (e.g., 'performance', 'readability', 'maintainability', 'security')
 - `style_guide_examples`: Optional existing code files to use as style/pattern reference (absolute paths)
 - `thinking_mode`: minimal|low|medium|high|max (default: medium, Gemini only)