chore: production build setup - capabilities, vite config, build instructions

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src-tauri/capabilities/default.json

@@ -0,0 +1,49 @@
+{
+  "$schema": "https://schema.tauri.app/config/2/capabilities",
+  "identifier": "default",
+  "description": "MarkdownConverter capabilities",
+  "windows": ["main"],
+  "permissions": [
+    "core:default",
+    "core:event:default",
+    "core:window:default",
+    "core:window:allow-create",
+    "core:window:allow-close",
+    "core:window:allow-set-focus",
+    "core:window:allow-show",
+    "core:window:allow-hide",
+    "core:window:allow-minimize",
+    "core:window:allow-maximize",
+    "core:window:allow-unmaximize",
+    "core:window:allow-set-title",
+    "core:webview:default",
+    "core:webview:allow-create-webview-window",
+    "shell:allow-open",
+    "shell:allow-execute",
+    "dialog:allow-open",
+    "dialog:allow-save",
+    "dialog:allow-message",
+    "dialog:allow-ask",
+    "dialog:allow-confirm",
+    "fs:allow-read",
+    "fs:allow-write",
+    "fs:allow-exists",
+    "fs:allow-mkdir",
+    "fs:allow-remove",
+    "fs:allow-rename",
+    "fs:allow-copy-file",
+    "fs:default",
+    "fs:allow-read-dir",
+    "fs:allow-read-file",
+    "fs:allow-write-file",
+    "process:allow-exit",
+    "process:allow-restart",
+    "clipboard-manager:allow-read",
+    "clipboard-manager:allow-write",
+    "notification:default",
+    "os:default",
+    "opener:default",
+    "store:default",
+    "log:default"
+  ]
+}