[management,client] 0.75.0 release with new desktop UI (#6473)

- **Wails v3 application** (`client/ui`) with a React + TypeScript + Tailwind frontend replacing the Fyne UI: main connection view, exit-node switcher, networks/peers browser with detail panels, profile management, settings (general, network, SSH, security, troubleshooting, appearance), debug-bundle creation, and a first-run welcome flow.
- **Internationalization**: go-i18n bundle with 9 locales (en, de, es, fr, hu, it, pt, ru, zh-CN) shared between the tray and the frontend.
- **New system tray** implementation with per-platform theme-aware icons, including a native XEmbed host for Linux (`xembed_tray_linux.c`) and a Linux theme watcher.
- **Session handling**: auth session watcher (`client/internal/auth/sessionwatch`), pending login flow, session-expiration dialog and tray notifications, and `netbird login` improvements.
- **Daemon API extensions** (`daemon.proto`): status stream subscription, event stream, networks/exit-node selection endpoints, and richer full status — with probe throttling on the daemon side to protect against UI-driven request storms.
- **UI preferences store** persisted per profile, autostart management via the daemon (single source of truth in HKCU on Windows).
- **Build system**: Taskfile-based builds per platform (macOS, Linux, Windows), Docker cross-compilation images, MSIX/NSIS/nfpm/AppImage packaging, and a new `frontend-ui` CI workflow.

Co-authored-by: Zoltan Papp <zoltan.pmail@gmail.com>
Co-authored-by: Eduard Gert <kontakt@eduardgert.de>
Co-authored-by: braginini <bangvalo@gmail.com>
Co-authored-by: Pascal Fischer <32096965+pascal-fischer@users.noreply.github.com>
Co-authored-by: riccardom <riccardomanfrin@gmail.com>

client/ui/build/docker/Dockerfile.server

@@ -0,0 +1,41 @@
+# Wails Server Mode Dockerfile
+# Multi-stage build for minimal image size
+
+# Build stage
+FROM golang:alpine AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apk add --no-cache git
+
+# Copy source code
+COPY . .
+
+# Remove local replace directive if present (for production builds)
+RUN sed -i '/^replace/d' go.mod || true
+
+# Download dependencies
+RUN go mod tidy
+
+# Build the server binary
+RUN go build -tags server -ldflags="-s -w" -o server .
+
+# Runtime stage - minimal image
+FROM gcr.io/distroless/static-debian12
+
+# Copy the binary
+COPY --from=builder /app/server /server
+
+# Copy frontend assets
+COPY --from=builder /app/frontend/dist /frontend/dist
+
+# Expose the default port
+EXPOSE 8080
+
+# Bind to all interfaces (required for Docker)
+# Can be overridden at runtime with -e WAILS_SERVER_HOST=...
+ENV WAILS_SERVER_HOST=0.0.0.0
+
+# Run the server
+ENTRYPOINT ["/server"]