[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/windows/msix/template.xml

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<MsixPackagingToolTemplate
+    xmlns="http://schemas.microsoft.com/msix/packaging/msixpackagingtool/template/2022">
+    <Settings
+        AllowTelemetry="false"
+        ApplyACLsToPackageFiles="true"
+        GenerateCommandLineFile="true"
+        AllowPromptForPassword="false">
+    </Settings>
+    <Installer
+        Path="netbird-ui"
+        Arguments=""
+        InstallLocation="C:\Program Files\NetBird\NetBird">
+    </Installer>
+    <PackageInformation
+        PackageName="NetBird"
+        PackageDisplayName="NetBird"
+        PublisherName="CN=NetBird"
+        PublisherDisplayName="NetBird"
+        Version="0.0.1.0"
+        PackageDescription="NetBird desktop client">
+        <Capabilities>
+            <Capability Name="runFullTrust" />
+            
+        </Capabilities>
+        <Applications>
+            <Application
+                Id="io.netbird.client"
+                Description="NetBird desktop client"
+                DisplayName="NetBird"
+                ExecutableName="netbird-ui"
+                EntryPoint="Windows.FullTrustApplication">
+                
+            </Application>
+        </Applications>
+        <Resources>
+            <Resource Language="en-us" />
+        </Resources>
+        <Dependencies>
+            <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+        </Dependencies>
+        <Properties>
+            <Framework>false</Framework>
+            <DisplayName>NetBird</DisplayName>
+            <PublisherDisplayName>NetBird</PublisherDisplayName>
+            <Description>NetBird desktop client</Description>
+            <Logo>Assets\AppIcon.png</Logo>
+        </Properties>
+    </PackageInformation>
+    <SaveLocation PackagePath="netbird-ui.msix" />
+    <PackageIntegrity>
+        <CertificatePath></CertificatePath>
+    </PackageIntegrity>
+</MsixPackagingToolTemplate>