feat: move Launch at Login to Settings, reorganize tray menu

[ibetitsmike]

What

• Removed "Launch at Login" checkbox from the tray menu
• Moved "Check for Updates" and "Settings" into the bottom section alongside Logout & Quit
• Added a new General section to the Settings page with a "Launch at Login" toggle

Tray menu layout (after)

[PR Sections]
———————————
See all on GitHub ↗
Refresh
———————————
Check for Updates
Settings
Logout
Quit PR Buddy

Files changed

Rust backend:

• src-tauri/src/autostart.rs — new module with is_autostart_enabled_cmd and set_autostart_cmd IPC commands
• src-tauri/src/menu.rs — removed autostart toggle, reorganized bottom section
• src-tauri/src/lib.rs — removed autostart menu handler, registered new commands

Svelte frontend:

• src/lib/SettingsPage.svelte — added General section with Launch at Login toggle

Verification

• cargo check ✅
• npm run check ✅ (0 errors, 0 warnings)
• npm run test ✅ (12/12 pass)
• npm run smoke ✅ (no import errors)

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