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>

scripts/install.sh

@@ -335,14 +335,18 @@ echo -e "${MUTED}  AI Penetration Testing Agent${NC}"
 echo ""
 echo -e "${MUTED}To get started:${NC}"
 echo ""
-echo -e "  ${CYAN}1.${NC} Set your LLM provider:"
-echo -e "     ${MUTED}export STRIX_LLM='openai/gpt-5'${NC}"
-echo -e "     ${MUTED}export LLM_API_KEY='your-api-key'${NC}"
+echo -e "  ${CYAN}1.${NC} Get your Strix API key:"
+echo -e "     ${MUTED}https://models.strix.ai${NC}"
 echo ""
-echo -e "  ${CYAN}2.${NC} Run a penetration test:"
+echo -e "  ${CYAN}2.${NC} Set your environment:"
+echo -e "     ${MUTED}export LLM_API_KEY='your-api-key'${NC}"
+echo -e "     ${MUTED}export STRIX_LLM='strix/claude-sonnet-4.6'${NC}"
+echo ""
+echo -e "  ${CYAN}3.${NC} Run a penetration test:"
 echo -e "     ${MUTED}strix --target https://example.com${NC}"
 echo ""
 echo -e "${MUTED}For more information visit ${NC}https://strix.ai"
+echo -e "${MUTED}Supported models ${NC}https://docs.strix.ai/llm-providers/overview"
 echo -e "${MUTED}Join our community ${NC}https://discord.gg/strix-ai"
 echo ""