Added LM Studio provider setup guide (#227)

* ## PR: Add LM Studio Provider Support

### Summary
Adds comprehensive LM Studio integration to openclaude, following the same pattern as the existing Ollama provider. LM Studio is a popular local LLM inference tool that exposes an OpenAI-compatible API.

### Changes (4 files, 672 insertions)

**New Files:**
- `lmstudio_provider.py` (377 lines) - Full provider implementation with:
  - Health check functions (`check_lmstudio_running`)
  - Model listing (`list_lmstudio_models`)
  - Chat completion (`lmstudio_chat`)
  - Streaming support (`lmstudio_chat_stream`)
  - Comprehensive docstring with setup instructions, troubleshooting, and model recommendations

- `test_lmstudio_provider.py` (227 lines) - Complete test suite with 12 passing tests covering:
  - API URL construction
  - Server health checks
  - Model listing
  - Chat completion functionality

**Modified Files:**
- `docs/quick-start-mac-linux.md` (+34 lines) - Added Option D: LM Studio with setup instructions and troubleshooting
- `docs/quick-start-windows.md` (+34 lines) - Added Option D: LM Studio with PowerShell syntax and troubleshooting

### Key Features
- No API key required (local inference)
- Default port: 1234 (LM Studio's standard)
- OpenAI-compatible API integration
- Consistent with existing provider patterns (Ollama, Atomic Chat)
- All tests passing (12/12)

### Usage
```bash
export CLAUDE_CODE_USE_OPENAI=1
export OPENAI_BASE_URL=http://localhost:1234/v1
export OPENAI_MODEL=your-model-name
openclaude
```

* made pr as doc only pr for lm studio

* LM studio recent ui changes fixes in doc

docs/quick-start-windows.md

@@ -66,6 +66,33 @@ openclaude
 
 No API key is needed for Ollama local models.
 
+### Option D: LM Studio
+
+Install LM Studio first from:
+
+- `https://lmstudio.ai/`
+
+Then in LM Studio:
+
+1. Download a model (e.g., Llama 3.1 8B, Mistral 7B)
+2. Go to the "Developer" tab
+3. Select your model and enable the server via the toggle
+
+Then run:
+
+```powershell
+$env:CLAUDE_CODE_USE_OPENAI="1"
+$env:OPENAI_BASE_URL="http://localhost:1234/v1"
+$env:OPENAI_MODEL="your-model-name"
+# $env:OPENAI_API_KEY="lmstudio"  # optional: some users need a dummy key
+
+openclaude
+```
+
+Replace `your-model-name` with the model name shown in LM Studio.
+
+No API key is needed for LM Studio local models (but uncomment the `OPENAI_API_KEY` line if you hit auth errors).
+
 ## 4. If `openclaude` Is Not Found
 
 Close PowerShell, open a new one, and try again:
@@ -89,6 +116,14 @@ Check the basics:
 - make sure Ollama is running
 - make sure the model was pulled successfully
 
+### For LM Studio
+
+- make sure LM Studio is installed
+- make sure LM Studio is running
+- make sure the server is enabled (toggle on in the "Developer" tab)
+- make sure a model is loaded in LM Studio
+- make sure the model name matches what you set in `OPENAI_MODEL`
+
 ## 6. Updating OpenClaude
 
 ```powershell