feat(proxmox): add journalctl streaming API endpoint for LXC containers

Add new /api/v1/proxmox/journalctl/:node/:vmid/:service endpoint that
streams real-time journalctl output from Proxmox LXC containers via
WebSocket connection. This enables live monitoring of container services
from the GoDoxy WebUI.

Implementation includes:
- New proxmox API handler with path parameter validation
- WebSocket upgrade for streaming output
- LXCCommand helper for executing commands over Proxmox VNC websocket
- LXCJournalctl wrapper for convenient journalctl -u service -f invocation
- Updated API documentation with proxmox integration

internal/api/v1/docs/swagger.json

@@ -165,6 +165,70 @@
         "operationId": "verify"
       }
     },
+    "/api/v1/proxmox/journalctl/{node}/{vmid}/{service}": {
+      "get": {
+        "description": "Get journalctl output",
+        "consumes": [
+          "application/json"
+        ],
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "proxmox",
+          "websocket"
+        ],
+        "summary": "Get journalctl output",
+        "parameters": [
+          {
+            "type": "string",
+            "name": "node",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "name": "service",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "integer",
+            "name": "vmid",
+            "in": "path",
+            "required": true
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Journalctl output",
+            "schema": {
+              "type": "string"
+            }
+          },
+          "400": {
+            "description": "Invalid request",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          },
+          "403": {
+            "description": "Unauthorized",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          },
+          "500": {
+            "description": "Internal server error",
+            "schema": {
+              "$ref": "#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "x-id": "journalctl",
+        "operationId": "journalctl"
+      }
+    },
     "/auth/callback": {
       "post": {
         "description": "Handles the callback from the provider after successful authentication",

internal/api/v1/docs/swagger.yaml

@@ -2076,6 +2076,48 @@ paths:
       tags:
       - agent
       x-id: verify
+  /api/v1/proxmox/journalctl/{node}/{vmid}/{service}:
+    get:
+      consumes:
+      - application/json
+      description: Get journalctl output
+      parameters:
+      - in: path
+        name: node
+        required: true
+        type: string
+      - in: path
+        name: service
+        required: true
+        type: string
+      - in: path
+        name: vmid
+        required: true
+        type: integer
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: Journalctl output
+          schema:
+            type: string
+        "400":
+          description: Invalid request
+          schema:
+            $ref: '#/definitions/ErrorResponse'
+        "403":
+          description: Unauthorized
+          schema:
+            $ref: '#/definitions/ErrorResponse'
+        "500":
+          description: Internal server error
+          schema:
+            $ref: '#/definitions/ErrorResponse'
+      summary: Get journalctl output
+      tags:
+      - proxmox
+      - websocket
+      x-id: journalctl
   /auth/callback:
     post:
       description: Handles the callback from the provider after successful authentication