Strix LLM Documentation and Config Changes (#315)

* feat: add to readme new keys

* feat: shoutout strix models, docs

* fix: mypy error

* fix: base api

* docs: update quickstart and models

* fixes: changes to docs

uniform api_key variable naming

* test: git commit hook

* nevermind it was nothing

* docs: Update default model to claude-sonnet-4.6 and improve Strix Router docs

- Replace gpt-5 and opus-4.6 defaults with claude-sonnet-4.6 across all docs and code
- Rewrite Strix Router (models.mdx) page with clearer structure and messaging
- Add Strix Router as recommended option in overview.mdx and quickstart prerequisites
- Update stale Claude 4.5 references to 4.6 in anthropic.mdx, openrouter.mdx, bug_report.md
- Fix install.sh links to point to models.strix.ai and correct docs URLs
- Update error message examples in main.py to use claude-sonnet-4-6

---------

Co-authored-by: 0xallam <ahmed39652003@gmail.com>

docs/quickstart.mdx

@@ -6,7 +6,7 @@ description: "Install Strix and run your first security scan"
 ## Prerequisites
 
 - Docker (running)
-- An LLM provider API key (OpenAI, Anthropic, or local model)
+- An LLM API key — use [Strix Router](/llm-providers/models) for the easiest setup, or bring your own key from any [supported provider](/llm-providers/overview)
 
 ## Installation
 
@@ -27,13 +27,23 @@ description: "Install Strix and run your first security scan"
 
 Set your LLM provider:
 
-```bash
-export STRIX_LLM="openai/gpt-5"
-export LLM_API_KEY="your-api-key"
-```
+<Tabs>
+  <Tab title="Strix Router">
+    ```bash
+    export STRIX_LLM="strix/claude-sonnet-4.6"
+    export LLM_API_KEY="your-strix-api-key"
+    ```
+  </Tab>
+  <Tab title="Bring Your Own Key">
+    ```bash
+    export STRIX_LLM="anthropic/claude-sonnet-4-6"
+    export LLM_API_KEY="your-api-key"
+    ```
+  </Tab>
+</Tabs>
 
 <Tip>
-For best results, use `openai/gpt-5`, `anthropic/claude-sonnet-4-5`, or `vertex_ai/gemini-3-pro-preview`.
+For best results, use `strix/claude-sonnet-4.6`, `strix/claude-opus-4.6`, or `strix/gpt-5.2`.
 </Tip>
 
 ## Run Your First Scan