feat: programmatic connector registration, budget-aware rotation, FAQ expansion

- Add register_connector() API for runtime connector registration (Python + TypeScript)
- Support "instance" injection for all 6 connector types (providers, rotation,
  secret stores, storage, observability, discovery) — not just providers
- Add strategy_instance pool config for direct rotation policy injection
- Add _setup_storage(), _setup_secrets(), _setup_discovery() to ModelMesh
- Add on_budget_exceeded pool config: "rotate" silently retries next model,
  "error" (default) raises BudgetExceededError — both router and streaming paths
- Expand FAQ Q10 with deployment guidance, TypeScript examples, custom secret
  store/storage/observability examples, extension reference table
- Expand FAQ Q4 with 8-strategy table, Q6 with budget rotation, Q9 with
  connector overview table and infrastructure connector configuration
- Add FAQ badge to README.md and docs/index.md
- Standardize FAQ links to .html for GitHub Pages
- Add "See also" footer links to all 8 guide documents
- All 1,879 tests passing (1,166 Python + 713 TypeScript)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: apartsin

README.md

@@ -14,6 +14,7 @@
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-MIT-green" alt="License"></a>
   <a href="https://github.com/ApartsinProjects/ModelMesh/actions"><img src="https://img.shields.io/badge/tests-1%2C879%20passed-brightgreen" alt="Tests"></a>
   <a href="https://apartsinprojects.github.io/ModelMesh/"><img src="https://img.shields.io/badge/docs-GitHub%20Pages-blue" alt="Documentation"></a>
+  <a href="docs/guides/FAQ.md"><img src="https://img.shields.io/badge/FAQ-10%20questions-orange" alt="FAQ"></a>
 </p>
 
 ---

docs/guides/BrowserUsage.md

@@ -347,3 +347,7 @@ docker compose -f tools/cors-proxy/docker-compose.yml up
 ```
 
 For production deployments, replace the development proxy with a production-grade reverse proxy (nginx, Caddy) that adds CORS headers. See [Security Considerations](#security-considerations) above.
+
+---
+
+See also: [FAQ](FAQ.html) · [Quick Start](QuickStart.html) · [Proxy Guide](ProxyGuide.html)

docs/guides/Capabilities.md

@@ -113,3 +113,7 @@ pools:
 ```
 
 Custom capability paths don't need aliases — use the full dotted path directly.
+
+---
+
+See also: [FAQ](FAQ.html) · [Model Capabilities](../ModelCapabilities.html) · [System Configuration](../SystemConfiguration.html)

docs/guides/ErrorHandling.md

@@ -135,3 +135,7 @@ The new exceptions maintain backward compatibility:
 - `BudgetExceededError` inherits from `ModelMeshError` → `Error`
 - Code catching base `Error` continues to work
 - All new fields are additive — no existing behavior changed
+
+---
+
+See also: [FAQ](FAQ.html) · [Quick Start](QuickStart.html) · [System Configuration](../SystemConfiguration.html)