internaluploader: server + docs

One-way upload server: authentik SSO pairing (QR + app-initiated deep
link), hashed device tokens, streamed sha256-verified uploads into the
metube directory as <sha256>.<ext>.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

server/tsconfig.json

@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "target": "ES2023",
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "lib": ["ES2023"],
+    "outDir": "dist",
+    "rootDir": "src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": false,
+    "sourceMap": false,
+
+    // Relative imports carry `.ts` and TypeScript rewrites them to `.js` on
+    // emit. This is what lets the SAME source run two ways: compiled to
+    // dist/ for the image, and under Node's strip-only type stripping for
+    // `node --test`, which resolves imports by their real filename. Without it
+    // any src module that imports another src module is untestable.
+    "allowImportingTsExtensions": true,
+    "rewriteRelativeImportExtensions": true
+  },
+  "include": ["src/**/*.ts"],
+  "exclude": ["node_modules", "dist", "test"]
+}