feat(api): add resize, crop, rotate, convert, compress, metadata, and color tool routes

Seven tool route files using the createToolRoute factory, registering 10 API
endpoints total (color adjustments covers 4 tool IDs). Also fixes the tool
factory generic to properly infer Zod output types and clamps the compress
binary-search quality to 1-100.

apps/api/src/routes/tools/crop.ts

@@ -0,0 +1,25 @@
+import { z } from "zod";
+import { createToolRoute } from "../tool-factory.js";
+import { crop } from "@stirling-image/image-engine";
+import sharp from "sharp";
+import type { FastifyInstance } from "fastify";
+
+const settingsSchema = z.object({
+  left: z.number().int().min(0),
+  top: z.number().int().min(0),
+  width: z.number().int().positive(),
+  height: z.number().int().positive(),
+});
+
+export function registerCrop(app: FastifyInstance) {
+  createToolRoute(app, {
+    toolId: "crop",
+    settingsSchema,
+    process: async (inputBuffer, settings, filename) => {
+      const image = sharp(inputBuffer);
+      const result = await crop(image, settings);
+      const buffer = await result.toBuffer();
+      return { buffer, filename, contentType: "image/png" };
+    },
+  });
+}