fix: frontend-backend integration — 14 issues resolved

- nginx: add proxy routes for /settings/, /templates/, /ipam/, /logs/, /admin/, /health
- dashboard: fix data format mismatch (servers[] not nodes[]/vms[])
- dashboard: add WebSocket subscription to dashboard_metrics for real-time updates
- dashboard: connect activity feed to /logs/api/logs endpoint
- dashboard: reduce polling to 15s with WS as primary update source
- graphs: fix rrddata response unwrap (backend returns {data:[],timeframe:''})
- graphs: add i18n translations for chart titles
- console: add xterm.js CSS import for proper terminal rendering
- console: add i18n translations (connecting, reconnect)
- workspace: add switcher dropdown in TopBar
- workspace: add edit dialog in WorkspacesPage
- workspace: create Zustand store with localStorage persistence
- workspace: add X-Active-Workspace header to API client
- sidebar: replace generic icon with actual favicon.svg logo
- instances: translate RowActionMenu and InstanceDetailPage strings
- locales: add graphs, console, workspace, instance tab keys to en/ru

backend/app/api/workspaces.py

@@ -11,8 +11,6 @@ All authenticated: list (filtered to their workspaces), get detail.
 from typing import List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Request, status
-from fastapi.responses import HTMLResponse
-from fastapi.templating import Jinja2Templates
 from sqlalchemy.orm import Session
 from loguru import logger
 
@@ -20,11 +18,9 @@ from ..db import get_db
 from ..models import Workspace, WorkspaceServer, WorkspaceUser, ProxmoxServer, User
 from ..schemas import WorkspaceCreate, WorkspaceUpdate, WorkspaceResponse, WorkspaceDetail
 from ..auth import get_current_user, PermissionChecker
-from ..template_helpers import add_i18n_context
 from ..logging_service import LoggingService
 
 router = APIRouter()
-templates = Jinja2Templates(directory="app/templates")
 
 
 # ---------------------------------------------------------------------------
@@ -150,24 +146,6 @@ def _build_detail(ws: Workspace) -> WorkspaceDetail:
     )
 
 
-# ===========================================================================
-# HTML Page
-# ===========================================================================
-
-@router.get("/workspaces", response_class=HTMLResponse, include_in_schema=False)
-def workspaces_page(
-    request: Request,
-):
-    """Admin workspace management page"""
-    context = {
-        "request": request,
-        "page_title": "Workspaces",
-    }
-    from ..template_helpers import add_i18n_context
-    context = add_i18n_context(request, context)
-    return templates.TemplateResponse("workspaces.html", context)
-
-
 # ===========================================================================
 # REST API
 # ===========================================================================