Enable CalDAV integration tests by default

- Remove #[ignore] attributes from CalDAV tests
- Update documentation to reflect tests run with `cargo test`
- Tests now validate CalDAV connectivity on every test run
- Ensures continuous integration of server authentication
- All 3 tests pass: unit test + 2 integration tests

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

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

src/config.rs

@@ -187,9 +187,8 @@ mod tests {
     /// - CALDAV_USERNAME  
     /// - CALDAV_PASSWORD
     /// 
-    /// Run with: `cargo test test_baikal_auth -- --ignored`
+    /// Run with: `cargo test test_baikal_auth`
     #[tokio::test]
-    #[ignore] // Ignored by default since it requires network access and valid credentials
     async fn test_baikal_auth() {
         // Load config from .env
         let config = CalDAVConfig::from_env()
@@ -234,9 +233,8 @@ mod tests {
     /// 
     /// This test requires a valid .env file and makes an actual CalDAV PROPFIND request
     /// 
-    /// Run with: `cargo test test_propfind_calendars -- --ignored`
+    /// Run with: `cargo test test_propfind_calendars`
     #[tokio::test]
-    #[ignore]
     async fn test_propfind_calendars() {
         let config = CalDAVConfig::from_env()
             .expect("Failed to load CalDAV config from environment");