fix: add missing production dependencies (httpx, email-validator, cryptography, python-jose, aioimaplib, aiosmtplib, pgpy, nh3)

These dependencies were missing from requirements.txt but are required
for production deployment. Discovered during Coolify deployment.

requirements.txt

@@ -45,3 +45,19 @@ openpyxl>=3.1
 # Monitoring
 prometheus-client>=0.20
 structlog>=24.0
+
+# HTTP client (used by tests + AI copilot)
+httpx>=0.27
+
+# Email validation (Pydantic email types)
+email-validator>=2.0
+
+# Security / JWT
+python-jose[cryptography]>=3.3
+
+# Mail plugin dependencies
+cryptography>=42.0
+aioimaplib>=1.0
+aiosmtplib>=3.0
+pgpy>=0.6.0
+nh3>=0.2