chore: remove all source code comments and internal artifacts

Strip every comment from the source (parsed with the TypeScript compiler so
strings, template literals, regex literals and JSX are never touched), and drop
internal/working artifacts that do not belong in the public repository
(design mockups, internal analysis docs, a stray backup file and an old log).
No functional change: build is green, the full test suite passes.

src/main/mega-public-api.ts

@@ -1,19 +1,3 @@
-// Mega.nz Public API: Filename + Size aus Public-Link ohne Mega-Debrid-Account.
-//
-// Erlaubt Pre-Resolve von Filenames sobald Links in die Queue kommen — ohne
-// Mega-Debrid-Quota anzufassen. Funktioniert fuer jeden public mega.nz Link
-// (mit Decryption-Key im URL-Fragment).
-//
-// Protokoll: https://g.api.mega.co.nz/cs
-//   Request:  POST [{"a":"g","g":1,"p":"<file-id>"}]
-//   Response: [{"s": <size>, "at": <base64url encrypted attributes>, ...}]
-//   Attribute-Decryption: AES-128-CBC, key = file-key[0..16], IV = 16x \0
-//   Plaintext startet mit "MEGA" gefolgt von JSON: {"n": "filename.mkv", ...}
-//
-// Datei-Key im URL-Fragment ist 32 Bytes (base64url-encoded). Bytes 0-15
-// sind der AES-Schluessel, 16-23 der CTR-Nonce, 24-31 die Meta-MAC. Fuer
-// Attribut-Decryption brauchen wir nur den AES-Teil.
-
 import crypto from "node:crypto";
 
 const MEGA_API_BASE = "https://g.api.mega.co.nz/cs";
@@ -53,7 +37,6 @@ export function parseMegaUrl(url: string): ParsedMegaLink | null {
   if (!m) return null;
   const id = m[1];
   const rawKey = base64UrlDecode(m[2]);
-  // Files: 32 Bytes (256 bit). Folders: 16 Bytes — wir behandeln nur Files.
   if (!rawKey || rawKey.length !== 32) return null;
   return { id, rawKey };
 }
@@ -123,8 +106,6 @@ export async function resolveMegaFilename(
     return null;
   }
 
-  // Mega gibt entweder ein Array mit File-Infos oder eine numerische Error-ID
-  // zurueck (z.B. -9 ENOENT, -11 EACCESS, -14 EKEY, -16 EBLOCKED, -25 EOVERQUOTA).
   if (typeof payload === "number") return null;
   if (!Array.isArray(payload) || payload.length === 0) return null;