Remove remaining verbose CalDAV discovery and authentication logs

- Remove discovery response XML dumps that flood console
- Remove calendar collection checking logs
- Remove authentication success messages
- Remove API call password length logging
- Fix unused variable warning

Backend now runs with minimal essential logging only.

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

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

backend/src/auth.rs

@@ -39,19 +39,13 @@ impl AuthService {
             request.username.clone(),
             request.password.clone(),
         );
-        println!("📝 Created CalDAV config");
 
         // Test authentication against CalDAV server
         let caldav_client = CalDAVClient::new(caldav_config.clone());
-        println!("🔗 Created CalDAV client, attempting to discover calendars...");
 
         // Try to discover calendars as an authentication test
         match caldav_client.discover_calendars().await {
-            Ok(calendars) => {
+            Ok(_calendars) => {
-                println!(
-                    "✅ Authentication successful! Found {} calendars",
-                    calendars.len()
-                );
                 
                 // Find or create user in database
                 let user_repo = UserRepository::new(&self.db);

backend/src/calendar.rs

@@ -665,7 +665,6 @@ impl CalDAVClient {
         }
 
         let body = response.text().await.map_err(CalDAVError::RequestError)?;
-        println!("Discovery response for {}: {}", path, body);
 
         let mut calendar_paths = Vec::new();
 
@@ -676,7 +675,6 @@ impl CalDAVClient {
 
                 // Extract href first
                 if let Some(href) = self.extract_xml_content(response_content, "href") {
-                    println!("🔍 Checking resource: {}", href);
 
                     // Check if this is a calendar collection by looking for supported-calendar-component-set
                     // This indicates it's an actual calendar that can contain events
@@ -700,14 +698,10 @@ impl CalDAVClient {
                             && !href.ends_with("/calendars/")
                             && href.ends_with('/')
                         {
-                            println!("📅 Found calendar collection: {}", href);
                             calendar_paths.push(href);
                         } else {
-                            println!("❌ Skipping system/root directory: {}", href);
                         }
                     } else {
-                        println!("ℹ️  Not a calendar collection: {} (is_calendar: {}, has_collection: {})", 
-                               href, is_calendar, has_collection);
                     }
                 }
             }

backend/src/handlers/auth.rs

@@ -82,10 +82,6 @@ pub async fn get_user_info(
         .await
         .map_err(|e| ApiError::Internal(format!("Failed to discover calendars: {}", e)))?;
 
-    println!(
-        "✅ Authentication successful! Found {} calendars",
-        calendar_paths.len()
-    );
 
     let calendars: Vec<CalendarInfo> = calendar_paths
         .iter()

backend/src/handlers/events.rs

@@ -35,7 +35,6 @@ pub async fn get_calendar_events(
     // Extract and verify token
     let token = extract_bearer_token(&headers)?;
     let password = extract_password_header(&headers)?;
-    println!("🔑 API call with password length: {}", password.len());
 
     // Create CalDAV config from token and password
     let config = state
@@ -127,7 +126,6 @@ pub async fn get_calendar_events(
         });
     }
 
-    println!("📅 Returning {} events", all_events.len());
     Ok(Json(all_events))
 }