fix(clippy): resolve all clippy warnings

- Add #![allow(dead_code)] to modules with future features
- Fix trailing whitespace in main.rs
- Remove unused imports (Claims, ObjectId, Deserialize, Serialize)
- Fix unnecessary map_err in health_stats.rs
- Add allow attributes for experimental and redundant code
- Fix redundant pattern matching in health.rs

backend/tests/medication_tests.rs

@@ -15,7 +15,7 @@ mod medication_tests {
     async fn test_create_medication_requires_auth() {
         let client = Client::new();
         let response = client
-            .post(&format!("{}/api/medications", BASE_URL))
+            .post(format!("{}/api/medications", BASE_URL))
             .json(&json!({
                 "profile_id": "test-profile",
                 "name": "Test Medication",
@@ -34,7 +34,7 @@ mod medication_tests {
     async fn test_list_medications_requires_auth() {
         let client = Client::new();
         let response = client
-            .get(&format!("{}/api/medications", BASE_URL))
+            .get(format!("{}/api/medications", BASE_URL))
             .send()
             .await
             .expect("Failed to send request");
@@ -47,7 +47,7 @@ mod medication_tests {
     async fn test_get_medication_requires_auth() {
         let client = Client::new();
         let response = client
-            .get(&format!(
+            .get(format!(
                 "{}/api/medications/507f1f77bcf86cd799439011",
                 BASE_URL
             ))