test: expand unit test coverage to all S3 edge cases; fix stale tests

Add comprehensive unit tests and repair stale tests that referenced the
old (pre-refactor) src/utils/* layout which no longer exists:

- s3-range: expand to 25 cases (suffix, clamping, malformed, zero-size,
  invalid totals, content-range formatting)
- s3-object-stream: rewrite against the real interfaces/s3 module; add
  multi-part ordering, ranges spanning parts, S3/CORS headers, fetch-error
  propagation
- s3-helpers-edge (new): compress heuristics, virtual-host bucket parsing,
  S3 route detection, client-IP/trustProxy, S3 response headers
- s3-auth-edge (new): verifyBodyHash, isS3Request, canonical-query-string
  encoding/sorting
- chunked-storage: rewrite against the real ChunkedStorage class (was
  importing deleted src/utils/chunked-storage) — chunk split, hashing,
  compression, size-limit guards, forwarding
- zip: fix stale import + add path-traversal/duplicate sanitization,
  locateZipEntry, empty-name fallback
- s3-docker-registry: fix stale src/config import; correct the rate-limit
  test to assert S3 routes INTENTIONALLY bypass rate limiting
- temp-stream (new): streamToTemp hashing, MD5, signature bytes, empty and
  oversized streams
- package.json: add the S3/unit files to test and test:s3 scripts

All new unit tests pass when run per-file (the project's documented mode to
avoid cross-file mock pollution). s3-sdk.test.ts (live E2E against a running
server) is deliberately excluded from test:s3.

package.json

@@ -8,11 +8,11 @@
     "build": "bun build src/index.ts --target=bun --outfile=dist/index.js && bun build src/infrastructure/persistence/drizzle/migrate.ts --target=bun --outfile=dist/migrate.js",
     "start": "NODE_ENV=production bun dist/index.js",
     "db:migrate": "bun dist/migrate.js",
-    "test": "bun test --preload ./test/helpers/setup-env.ts test/rateLimit.test.ts && bun test --preload ./test/helpers/setup-env.ts test/file.test.ts && bun test --preload ./test/helpers/setup-env.ts test/telegram.test.ts && bun test --preload ./test/helpers/setup-env.ts test/upload.test.ts && bun test --preload ./test/helpers/setup-env.ts test/files.test.ts && bun test --preload ./test/helpers/setup-env.ts test/health.test.ts && bun test --preload ./test/helpers/setup-env.ts test/db.test.ts &Line truncated
+    "test": "bun test --preload ./test/helpers/setup-env.ts test/rateLimit.test.ts && bun test --preload ./test/helpers/setup-env.ts test/file.test.ts && bun test --preload ./test/helpers/setup-env.ts test/telegram.test.ts && bun test --preload ./test/helpers/setup-env.ts test/upload.test.ts && bun test --preload ./test/helpers/setup-env.ts test/files.test.ts && bun test --preload ./test/helpers/setup-env.ts test/health.test.ts && bun test --preload ./test/helpers/setup-env.ts test/db.test.ts &Line truncated
     "test:s3-auth": "bun test --preload ./test/helpers/setup-env.ts test/s3-auth.test.ts",
     "test:s3-ops": "bun test --preload ./test/helpers/setup-env.ts test/s3-operations.test.ts",
     "test:web-api": "bun test --preload ./test/helpers/setup-env.ts test/web-api.test.ts",
-    "test:s3": "bun test --preload ./test/helpers/setup-env.ts test/s3-auth.test.ts && bun test --preload ./test/helpers/setup-env.ts test/s3-operations.test.ts && bun test --preload ./test/helpers/setup-env.ts test/web-api.test.ts",
+    "test:s3": "bun test --preload ./test/helpers/setup-env.ts test/s3-auth.test.ts && bun test --preload ./test/helpers/setup-env.ts test/s3-auth-edge.test.ts && bun test --preload ./test/helpers/setup-env.ts test/s3-operations.test.ts && bun test --preload ./test/helpers/setup-env.ts test/s3-range.test.ts && bun test --preload ./test/helpers/setup-env.ts test/s3-object-stream.test.ts && bun test --preload ./test/helpers/setup-env.ts test/object-stream-parallel.test.ts && bun test --preload ./Line truncated
     "lint": "bunx biome check src test",
     "format": "bunx biome format --write src test",
     "prepare": "husky"