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/Personal.php

@@ -14,12 +14,12 @@ use OCP\IUserSession;
 use OCP\Settings\ISettings;
 
 /**
- * Personal settings panel for MCP Server.
+ * Personal settings panel for Astroglobe.
  *
- * Displays user session information, background access status,
- * and provides controls for managing MCP server integration.
+ * Displays semantic search status, background indexing access,
+ * and provides controls for managing content indexing.
  *
- * Uses OAuth PKCE flow - each user must authorize access to MCP server.
+ * Uses OAuth PKCE flow - each user must authorize background access.
  */
 class Personal implements ISettings {
 	private $client;
@@ -146,7 +146,7 @@ class Personal implements ISettings {
 	 * @return string The section ID
 	 */
 	public function getSection(): string {
-		return 'mcp';
+		return 'astroglobe';
 	}
 
 	/**