feat: implement Confluence OAuth integration and connector routes

- Added support for Confluence OAuth with new environment variables for client ID, client secret, and redirect URI.
- Implemented Confluence connector routes for OAuth flow, including authorization and callback handling.
- Enhanced Confluence connector to support both OAuth 2.0 and legacy API token authentication methods.
- Updated Confluence indexing logic to utilize OAuth credentials with auto-refresh capabilities.
- Removed outdated Confluence UI components and adjusted frontend logic to reflect the new integration.

surfsense_web/components/assistant-ui/connector-popup/constants/connector-constants.ts

@@ -65,6 +65,13 @@ export const OAUTH_CONNECTORS = [
 		connectorType: EnumConnectorName.JIRA_CONNECTOR,
 		authEndpoint: "/api/v1/auth/jira/connector/add/",
 	},
+	{
+		id: "confluence-connector",
+		title: "Confluence",
+		description: "Search documentation",
+		connectorType: EnumConnectorName.CONFLUENCE_CONNECTOR,
+		authEndpoint: "/api/v1/auth/confluence/connector/add/",
+	},
 ] as const;
 
 // Content Sources (tools that extract and import content from external sources)
@@ -85,12 +92,6 @@ export const CRAWLERS = [
 
 // Non-OAuth Connectors (redirect to old connector config pages)
 export const OTHER_CONNECTORS = [
-	{
-		id: "confluence-connector",
-		title: "Confluence",
-		description: "Search documentation",
-		connectorType: EnumConnectorName.CONFLUENCE_CONNECTOR,
-	},
 	{
 		id: "bookstack-connector",
 		title: "BookStack",