Filter model selector by API keys and add user-facing documentation

- Model selector now only shows models with configured API keys
- Added yellow hint in model selector UI explaining the filtering
- Updated README.md to document the filtering behavior in both API Keys and /model sections
- Bumped version to 0.7.11

packages/web-ui/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@mariozechner/pi-web-ui",
-	"version": "0.7.10",
+	"version": "0.7.11",
 	"description": "Reusable web UI components for AI chat interfaces powered by @mariozechner/pi-ai",
 	"type": "module",
 	"main": "dist/index.js",
@@ -18,8 +18,8 @@
 	},
 	"dependencies": {
 		"@lmstudio/sdk": "^1.5.0",
-		"@mariozechner/pi-ai": "^0.7.10",
-		"@mariozechner/pi-tui": "^0.7.10",
+		"@mariozechner/pi-ai": "^0.7.11",
+		"@mariozechner/pi-tui": "^0.7.11",
 		"docx-preview": "^0.3.7",
 		"jszip": "^3.10.1",
 		"lucide": "^0.544.0",