feat: add EXE projects with versioned install configuration

- EXE project kind next to MSIX: formats.exe, new EXE projects, EXE app
  info (architecture, UpgradeCode), per-kind workspace; EXE builds and
  signing are still refused explicitly (#9).
- Install configuration tabs: registry grid, shortcuts and installer
  properties with formatted-text checks (#10).
- Per-version .isver files: version list, add dialog, lock/unlock,
  delete with .isver.bak backups, description (#11).
- Major/patch versions with cumulative patch checks and automatic kind
  selection (#12).
- 설치화면 tab: setup steps, theme and scripts per version (#13).
- Preferences: theme and display language (#14).
- 설치파일 tab as an Explorer-style tree: per-row add/remove, Windows
  folder install locations (FileRule.targetRoot), picked files placed
  with FileRule.sourceFolder, unsaved-rule file preview (#17).

Checks: cargo fmt/clippy/test, 82 frontend tests, Vite build and the
msix-studio build pass. npm ci, GUI click tests and real EXE builds were
not run.

Refs #9 #10 #11 #12 #13 #14 #17

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/code-design/examples/exe.isproj

@@ -0,0 +1,32 @@
+{
+  "schemaVersion": 2,
+  "product": {
+    "displayName": "Sample Desktop Tool",
+    "manufacturer": "Example Publisher",
+    "displayVersion": "1.0.0"
+  },
+  "sources": [
+    {
+      "alias": "appPayload"
+    }
+  ],
+  "files": [],
+  "formats": {
+    "exe": {
+      "architecture": "x64",
+      "upgradeCode": null,
+      "installScope": "perMachine",
+      "installRoot": "[ProgramFiles64Folder]Example Publisher\\Sample Desktop Tool",
+      "properties": []
+    }
+  },
+  "targets": [
+    {
+      "id": "exe-direct",
+      "format": "exe",
+      "delivery": "offline-singlefile",
+      "distribution": "direct",
+      "signingProfileRef": null
+    }
+  ]
+}