docs(api): achieve 100% endpoint coverage in OpenAPI spec and VitePress docs (#54)

Add 12 previously undocumented routes to the OpenAPI 3.1 specification:
content-aware-resize, edit-metadata (+ inspect), stitch, pdf-to-image
(+ info, preview), gif-tools/info, remove-background/effects, preview,
pipeline/tools, and pipeline/batch. Fix license from MIT to AGPL-3.0,
correct DELETE /files response from 204 to 200 with body, and update
VitePress API docs (rest.md tool table, ai.md model parameters). Also
register the sharpen operation in the image-engine OPERATION_MAP so it
can be used as a standalone pipeline step.

Co-authored-by: stirling-image <stirling-image@users.noreply.github.com>

packages/image-engine/src/engine.ts

@@ -13,6 +13,7 @@ import { resize } from "./operations/resize.js";
 import { rotate } from "./operations/rotate.js";
 import { saturation } from "./operations/saturation.js";
 import { sepia } from "./operations/sepia.js";
+import { sharpen } from "./operations/sharpen.js";
 import { stripMetadata } from "./operations/strip-metadata.js";
 import type {
   BrightnessOptions,
@@ -29,6 +30,7 @@ import type {
   RotateOptions,
   SaturationOptions,
   Sharp,
+  SharpenOptions,
   StripMetadataOptions,
 } from "./types.js";
 import { getImageInfo } from "./utils/metadata.js";
@@ -55,6 +57,7 @@ const OPERATION_MAP: Record<
   "color-channels": (img, opts) => colorChannels(img, opts as unknown as ColorChannelOptions),
   grayscale: (img) => grayscale(img),
   sepia: (img) => sepia(img),
+  sharpen: (img, opts) => sharpen(img, opts as unknown as SharpenOptions),
   invert: (img) => invert(img),
   "edit-metadata": (img, opts) => editMetadata(img, opts as unknown as EditMetadataOptions),
 };