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.

scripts/provider_smoke_check.mjs

@@ -66,8 +66,6 @@ async function callRealDebrid(link) {
   };
 }
 
-// megaCookie is intentionally cached at module scope so that multiple
-// callMegaDebrid() invocations reuse the same session cookie.
 async function callMegaDebrid(link) {
   if (!megaCookie) {
     const loginRes = await fetch("https://www.mega-debrid.eu/index.php?form=login", {