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>

strix/llm/llm.py

@@ -200,15 +200,10 @@ class LLM:
             "stream_options": {"include_usage": True},
         }
 
-        if api_key := Config.get("llm_api_key"):
-            args["api_key"] = api_key
-        if api_base := (
-            Config.get("llm_api_base")
-            or Config.get("openai_api_base")
-            or Config.get("litellm_base_url")
-            or Config.get("ollama_api_base")
-        ):
-            args["api_base"] = api_base
+        if self.config.api_key:
+            args["api_key"] = self.config.api_key
+        if self.config.api_base:
+            args["api_base"] = self.config.api_base
         if self._supports_reasoning():
             args["reasoning_effort"] = self._reasoning_effort