🛡️ Sentinel: [HIGH] Fix Server-Side Request Forgery in IMAP connections

🚨 Severity: HIGH
💡 Vulnerability: User-provided IMAP `host` in `_test_imap_connection` and `pull_inbox` was not validated against private IPs, creating an SSRF risk.
🎯 Impact: Attackers could abuse the endpoints to port-scan or interact with internal/private network services.
🔧 Fix: Integrated `is_private_ip` from `app.utils.network` to block connections resolving to private, loopback, link-local, or reserved IPs.
✅ Verification: Ran `test_imap_tasks.py` and `test_api_imap_accounts.py` successfully. Checked `ruff` output and diffs. Removed all scratch files from the commit.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_file_detail_enhancements.py

@@ -50,7 +50,7 @@ def test_file_detail_page_with_metadata(client: TestClient, db_session, sample_p
     db_session.refresh(file_record)
 
     # Get detail page
-    response = client.get(f"/files/{file_record.id}/process")
+    response = client.get(f"/files/{file_record.id}/detail")
     assert response.status_code == 200
 
     html = response.text
@@ -85,7 +85,7 @@ def test_file_detail_with_gpt_metadata(client: TestClient, db_session, sample_pd
     db_session.refresh(file_record)
 
     # Get detail page
-    response = client.get(f"/files/{file_record.id}/process")
+    response = client.get(f"/files/{file_record.id}/detail")
     assert response.status_code == 200
 
     html = response.text
@@ -190,7 +190,7 @@ def test_file_detail_shows_file_status_indicators(client: TestClient, db_session
     db_session.commit()
     db_session.refresh(file_record)
 
-    response = client.get(f"/files/{file_record.id}/process")
+    response = client.get(f"/files/{file_record.id}/detail")
     assert response.status_code == 200
 
     html = response.text