feat: complete Chinese localization + contributor guide (openclaw#60)

Localize ~40 remaining hardcoded English strings (toasts, canvas, webchat, download dialog). Both en-US and zh-CN now have 163 resource keys, fully in sync.

- Add LocalizationHelper.SetLanguageOverride() for unpackaged app locale testing
- Add docs/LOCALIZATION.md contributor guide
- File issue openclaw#61 calling for community translations

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

ci: sign ARM64 artifacts on x64 runner in release job

The Azure Trusted Signing dlib (x64) fails with exit code 3 when
running under emulation on the ARM64 runner (windows-11-arm).

Fix: Skip signing in the build/build-msix jobs for ARM64 targets.
Instead, sign ARM64 executables and MSIX packages in the release job,
which runs on windows-latest (x64) where the signing dlib works.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Release v0.4.5

Release v0.4.4

Release v0.4.3

Improve web chat security UX and bump to 0.4.2

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Fix issue openclaw#18 README allowCommands docs

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Bump version to 0.3.0

v0.2.0 - WebView2 fix and .NET 10

Highlights:
- Fix WebView2 in unpackaged WinUI on ARM64 and x64
- Upgrade to .NET 10 and Windows App SDK 1.8.4
- Friendly error when gateway unreachable
- Build script auto-detects architecture
- Security: Don't log tokens in navigation events