feat: pre-generate Directus image previews

Bundle extension (upload hook + API endpoint + admin module) that warms
Directus image transform cache in-process with an explicit acceptFormat,
so the generated file matches the browser's cache key byte-for-byte.

- resumable, window-aware backfill with progress + cancel
- system + custom presets, effective-format reporting, shadow warnings
- storage breakdown (previews vs originals), human-readable API fields
- diagnostics: resolve-plan prediction, per-file generate, ops ring buffer
- isolated dev/staging compose stack + deploy/rollback scripts

Verified on Directus 11.17.4: 40/40 tests, hash-match gate passed,
idempotent backfill, custom fixed-format presets, error surfacing.

tsconfig.json

@@ -0,0 +1,28 @@
+{
+	"compilerOptions": {
+		"target": "ES2019",
+		"lib": ["ES2019", "DOM"],
+		"moduleResolution": "node",
+		"strict": true,
+		"noFallthroughCasesInSwitch": true,
+		"esModuleInterop": true,
+		"noImplicitAny": true,
+		"noImplicitThis": true,
+		"noImplicitReturns": true,
+		"noUnusedLocals": true,
+		"noUncheckedIndexedAccess": true,
+		"noUnusedParameters": true,
+		"alwaysStrict": true,
+		"strictNullChecks": true,
+		"strictFunctionTypes": true,
+		"strictBindCallApply": true,
+		"strictPropertyInitialization": true,
+		"resolveJsonModule": false,
+		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true,
+		"allowSyntheticDefaultImports": true,
+		"isolatedModules": true,
+		"rootDir": "./src"
+	},
+	"include": ["./src/**/*.ts"]
+}