fix: add missing Python dependencies for Docker

Added missing packages required by backend code:
- redis>=5.0.0 (caching layer)
- celery>=5.4.0 (async tasks)
- prometheus-client>=0.20.0 (metrics)
- opentelemetry-* (distributed tracing)
- jaeger-client>=4.8.0 (tracing)
- python-json-logger>=2.0.7 (structured logging)

Also fixed IMMUTABLE function errors in migrations (already committed).

All dependencies now installed in Docker images.

pyproject.toml

@@ -20,6 +20,14 @@ dependencies = [
     "python-jose[cryptography]>=3.3.0",
     "passlib[bcrypt]>=1.7.4",
     "email-validator>=2.0.0",
+    "redis>=5.0.0",
+    "celery>=5.4.0",
+    "prometheus-client>=0.20.0",
+    "opentelemetry-api>=1.24.0",
+    "opentelemetry-sdk>=1.24.0",
+    "opentelemetry-instrumentation-fastapi>=0.45b0",
+    "jaeger-client>=4.8.0",
+    "python-json-logger>=2.0.7",
 ]
 
 [dependency-groups]