Comprehensive bugfix release v1.6.45

Fix ~70 issues across the entire codebase including security fixes,
error handling improvements, test stabilization, and code quality.

- Fix TLS race condition with reference-counted acquire/release
- Bind debug server to 127.0.0.1 instead of 0.0.0.0
- Add overall timeout to MegaWebFallback
- Stream update installer to disk instead of RAM buffering
- Add path traversal protection in JVM extractor
- Cache DdownloadClient with credential-based invalidation
- Add .catch() to all fire-and-forget IPC calls
- Wrap app startup, clipboard, session-log in try/catch
- Add timeouts to container.ts fetch calls
- Fix variable shadowing, tsconfig path, line endings
- Stabilize tests with proper cleanup and timing tolerance
- Fix installer privileges, scripts, and afterPack null checks
- Delete obsolete _upload_release.mjs

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

installer/RealDebridDownloader.iss

@@ -25,11 +25,11 @@ AppPublisher=Sucukdeluxe
 DefaultDirName={autopf}\{#MyAppName}
 DefaultGroupName={#MyAppName}
 OutputDir={#MyOutputDir}
-OutputBaseFilename=Real-Debrid-Downloader-Setup-{#MyAppVersion}
+OutputBaseFilename=Real-Debrid-Downloader Setup {#MyAppVersion}
 Compression=lzma
 SolidCompression=yes
 WizardStyle=modern
-PrivilegesRequired=admin
+PrivilegesRequired=lowest
 ArchitecturesInstallIn64BitMode=x64compatible
 UninstallDisplayIcon={app}\{#MyAppExeName}
 SetupIconFile={#MyIconFile}
@@ -39,8 +39,8 @@ Name: "german"; MessagesFile: "compiler:Languages\German.isl"
 Name: "english"; MessagesFile: "compiler:Default.isl"
 
 [Files]
-Source: "{#MySourceDir}\\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
-Source: "{#MyIconFile}"; DestDir: "{app}"; DestName: "app_icon.ico"; Flags: ignoreversion
+Source: "{#MySourceDir}\\*"; DestDir: "{app}"; Flags: recursesubdirs createallsubdirs
+Source: "{#MyIconFile}"; DestDir: "{app}"; DestName: "app_icon.ico"
 
 [Icons]
 Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; IconFilename: "{app}\app_icon.ico"