refactor(astrolabe): reframe UI as semantic search service

Update all user-facing text to focus on Astroglobe as a semantic
search service for Nextcloud users:

- info.xml: New description focusing on finding content by meaning
- Settings sections: Renamed from "MCP Server" to "Astroglobe"
- Personal settings: Reframed as content indexing controls
- Admin settings: Reframed as semantic search administration
- OAuth flow: Explains semantic search benefits to users

Key messaging changes:
- "MCP Server" → "Astroglobe"
- "Grant Background Access" → "Enable Semantic Search"
- "Vector Sync" → "Content Indexing"
- Focus on user benefits: natural language search, finding by meaning

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

third_party/astroglobe/lib/Settings/Admin.php

@@ -12,10 +12,10 @@ use OCP\IConfig;
 use OCP\Settings\ISettings;
 
 /**
- * Admin settings panel for MCP Server.
+ * Admin settings panel for Astroglobe.
  *
- * Displays server status, vector sync metrics, configuration,
- * and provides administrative controls.
+ * Displays semantic search service status, indexing metrics,
+ * configuration, and provides administrative controls.
  */
 class Admin implements ISettings {
 	private $client;
@@ -89,7 +89,7 @@ class Admin implements ISettings {
 	 * @return string The section ID
 	 */
 	public function getSection(): string {
-		return 'mcp';
+		return 'astroglobe';
 	}
 
 	/**