feat: Implement dynamic Gatekeeper proxy and enhance service health monitoring

- **Implemented Dynamic Gatekeeper (Anubis) Proxy:**
  - Introduced Anubis as a Gatekeeper proxy layer for services (`web`, `web-staging`, `feedback`, `health`).
  - Added `docker-gen` setup (`docker-compose_gatekeeper.template.yml`, `gatekeeper-manager`) to dynamically configure Anubis instances based on container labels (`enable_gatekeeper=true`).
  - Updated HAProxy to route traffic through the respective Gatekeeper services.

- **Enhanced Service Health Monitoring & Checks:**
  - Integrated `django-health-check` into the Django application, providing detailed health endpoints (e.g., `/health/`).
  - Replaced the custom health check view with `django-health-check` URLs.
  - Added `psutil` for system metrics in health checks.
  - Made Gatus configuration dynamic using `docker-gen` (`config.template.yaml`), allowing automatic discovery and monitoring of service instances (e.g., web workers).
  - Externalized Gatus SMTP credentials to environment variables.
  - Strengthened `docker-compose_core.yml` with a combined `db-redis-healthcheck` service reporting to Gatus.
  - Added explicit health checks for `db` and `redis` services in `docker-compose.yml`.

- **Improved Docker & Compose Configuration:**
  - Added `depends_on` conditions in `docker-compose.yml` for `web` and `celery` services to wait for the database.
  - Updated `ALLOWED_HOSTS` in `docker-compose_staging.yml` and `docker-compose_web.yml` to include internal container names for Gatekeeper communication.
  - Set `DEBUG=False` for staging services.
  - Removed `.env.production` from `.gitignore` (standardized to `.env`).
  - Streamlined `scripts/entrypoint.sh` by removing the call to the no-longer-present `/deploy.sh`.

- **Dependency Updates:**
  - Added `django-health-check>=3.18.3` and `psutil>=7.0.0` to `pyproject.toml` and `uv.lock`.
  - Updated `settings.py` to include `health_check` apps, configuration, and use `REDIS_URL` consistently.

- **Streamlined deployment script used in GHA:**
  - Updated the workflow to copy new server files and create a new `.env` file in the temporary directory before moving them into place.
  - Consolidated the stopping and removal of old containers into a single step for better clarity and efficiency.
  - Reduce container downtime by rearranging stop/start steps.

server/gatus/config.yaml

@@ -8,14 +8,19 @@ connectivity:
     target: 1.1.1.1:53
     interval: 60s
 external-endpoints:
-  - name: pg_isready
-    group: db
+  - name: Database
+    group: Services
+    token: "${GATUS_TOKEN}"
+    alerts:
+      - type: email
+  - name: Redis
+    group: Services
     token: "${GATUS_TOKEN}"
     alerts:
       - type: email
 endpoints:
   - name: Domain
-    group: expirations
+    group: Expirations
     url: "https://pkmntrade.club"
     interval: 1h
     conditions:
@@ -23,7 +28,7 @@ endpoints:
     alerts:
       - type: email
   - name: Certificate
-    group: expirations
+    group: Expirations
     url: "https://pkmntrade.club"
     interval: 1h
     conditions:
@@ -31,7 +36,7 @@ endpoints:
     alerts:
       - type: email
   - name: Cloudflare
-    group: dns
+    group: DNS
     url: "1.1.1.1"
     interval: 60s
     dns:
@@ -42,7 +47,7 @@ endpoints:
     alerts:
       - type: email
   - name: Google
-    group: dns
+    group: DNS
     url: "8.8.8.8"
     interval: 60s
     dns:
@@ -53,7 +58,7 @@ endpoints:
     alerts:
       - type: email
   - name: Quad9
-    group: dns
+    group: DNS
     url: "9.9.9.9"
     interval: 60s
     dns:
@@ -64,7 +69,7 @@ endpoints:
     alerts:
       - type: email
   - name: HAProxy
-    group: loadbalancer
+    group: Load Balancer
     url: "http://loba/"
     interval: 60s
     conditions:
@@ -73,60 +78,22 @@ endpoints:
     alerts:
       - type: email
   - name: Feedback
-    group: backends
+    group: Services
     url: "http://feedback:3000/"
     interval: 60s
     conditions:
       - "[STATUS] == 200"
     alerts:
       - type: email
-  - name: Web Worker 1
-    group: backends
-    url: "http://pkmntrade-club-web-1:8000/health/"
-    interval: 60s
-    conditions:
-      - "[STATUS] == 200"
-      #- "[BODY] == OK/HEALTHY"
-      #- [BODY].database == UP 
-      # must return json like {"database": "UP"} first
-    alerts:
-      - type: email
-  - name: Web Worker 2
-    group: backends
-    url: "http://pkmntrade-club-web-2:8000/health/"
-    interval: 60s
-    conditions:
-      - "[STATUS] == 200"
-      #- "[BODY] == OK/HEALTHY"
-    alerts:
-      - type: email
-  - name: Web Worker 3
-    group: backends
-    url: "http://pkmntrade-club-web-3:8000/health/"
-    interval: 60s
-    conditions:
-      - "[STATUS] == 200"
-      #- "[BODY] == OK/HEALTHY"
-    alerts:
-      - type: email
-  - name: Web Worker 4
-    group: backends
-    url: "http://pkmntrade-club-web-4:8000/health/"
-    interval: 60s
-    conditions:
-      - "[STATUS] == 200"
-      #- "[BODY] == OK/HEALTHY"
-    alerts:
-      - type: email
-  # todo: add cadvisor checks via api https://github.com/google/cadvisor/blob/master/docs/api.md
+
 alerting:
   email:
-    from: noreply@pkmntrade.club
-    username: dd2cd354-de6d-4fa4-bfe8-31c961cb4e90
-    password: 1622e8a1-9a45-4a7f-8071-cccca29d8675
-    host: smtp.tem.scaleway.com
-    port: 465
-    to: rob@badblocks.email
+    from: "${GATUS_SMTP_FROM}"
+    username: "${GATUS_SMTP_USER}"
+    password: "${GATUS_SMTP_PASS}"
+    host: "${GATUS_SMTP_HOST}"
+    port: ${GATUS_SMTP_PORT}
+    to: "${GATUS_SMTP_TO}"
     client:
       insecure: false
     default-alert: