Add daily traffic limits, auto-sort packages, Debrid-Link multi-key improvements

Daily traffic limits:
- Per-provider daily download limit (configurable in GB per provider)
- Per Debrid-Link API key daily limit (individual limits per key)
- Usage tracking with automatic daily reset at midnight
- Provider is skipped when daily limit reached, falls back to next provider
- Reset button per provider and per Debrid-Link key in account settings
- Hoster routing skips daily-limited providers gracefully

Debrid-Link multi-key improvements:
- Keys now display with labels (#1, #2...) and masked tokens in account list
- Option to show detailed per-key view with individual usage stats
- Keys that hit their daily limit are automatically skipped
- providerAccountId/providerAccountLabel stored per download item

Auto-sort packages by progress:
- Active packages automatically sorted to top during downloads
- Sorted by completion ratio, then downloaded bytes
- Toggle in settings (autoSortPackagesByProgress)

UI polish:
- Package column headers: flatter, more transparent design
- LinkSnappy mode label: "Login" renamed to "Web"
- Account list: new toggle for detailed Debrid-Link key display
- Account usage stats section with warning styling

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/constants.ts

@@ -1,6 +1,7 @@
 import path from "node:path";
 import os from "node:os";
 import { AppSettings } from "../shared/types";
+import { getProviderUsageDayKey } from "../shared/provider-daily-limits";
 import packageJson from "../../package.json";
 
 export const APP_NAME = "Multi Debrid Downloader";
@@ -94,6 +95,8 @@ export function defaultSettings(): AppSettings {
     minimizeToTray: false,
     theme: "dark" as const,
     collapseNewPackages: true,
+    accountListShowDetailedDebridLinkKeys: false,
+    autoSortPackagesByProgress: true,
     autoSkipExtracted: false,
     confirmDeleteSelection: true,
     totalDownloadedAllTime: 0,
@@ -103,6 +106,11 @@ export function defaultSettings(): AppSettings {
     autoExtractWhenStopped: true,
     disabledProviders: [],
     hosterRouting: {},
+    providerDailyLimitBytes: {},
+    providerDailyUsageBytes: {},
+    debridLinkApiKeyDailyLimitBytes: {},
+    debridLinkApiKeyDailyUsageBytes: {},
+    providerDailyUsageDay: getProviderUsageDayKey(),
     scheduledStartEpochMs: 0
   };
 }