feat(signal-cli): switch to native signal-cli daemon with JSON-RPC HTTP endpoint

- Replace bbernhard/signal-cli-rest-api wrapper with native signal-cli 0.14.5
- Run signal-cli daemon in HTTP mode matching astro-orbiter working config
- Expose JSON-RPC API at /api/v1/rpc for Hermes gateway compatibility
- Switch health probes from HTTP /v1/health to TCP port check
- Maintain existing PVC mount path /home/.local/share/signal-cli

This fixes the missing /api/v1/rpc endpoint that Hermes requires for
Signal message delivery.

cluster/applications/signal-cli/deployment.yaml

@@ -21,16 +21,22 @@ spec:
     spec:
       hostNetwork: true  # Use host network for Signal WebSocket connectivity
       containers:
-      - name: signal-cli-rest-api
-        image: bbernhard/signal-cli-rest-api:latest  # Using latest to match astro-orbiter signal-cli 0.14.3
+      - name: signal-cli
+        image: registry.gitlab.com/packaging/signal-cli/signal-cli-native:v0.14.5
         imagePullPolicy: IfNotPresent
+        command: ["/usr/bin/signal-cli"]
+        args:
+        - "--config"
+        - "/home/.local/share/signal-cli"
+        - "--account"
+        - "+126****8840"
+        - "daemon"
+        - "--http"
+        - "0.0.0.0:8080"
         ports:
         - containerPort: 8080
           name: http
           protocol: TCP
-        env:
-        - name: MODE
-          value: "json-rpc"  # json-rpc mode for API compatibility
         volumeMounts:
         - name: signal-data
           mountPath: /home/.local/share/signal-cli
@@ -42,16 +48,14 @@ spec:
             memory: "512Mi"
             cpu: "500m"
         livenessProbe:
-          httpGet:
-            path: /v1/health
+          tcpSocket:
             port: 8080
           initialDelaySeconds: 30
           periodSeconds: 10
           timeoutSeconds: 5
           failureThreshold: 3
         readinessProbe:
-          httpGet:
-            path: /v1/health
+          tcpSocket:
             port: 8080
           initialDelaySeconds: 10
           periodSeconds: 5