feat: add image optimization and settings page

- Add persistent disk cache for processed images
- Optimize image processing with short-circuit and quality settings
- Add WebP lossy encoding with configurable quality
- Add settings API endpoints (GET/POST /settings, cache management)
- Add database table for app configuration
- Add /settings page in backoffice for image/cache/limits config
- Add cache stats and clear functionality
- Update navigation with settings link

apps/backoffice/app/api/settings/[key]/route.ts

@@ -0,0 +1,59 @@
+import { NextRequest, NextResponse } from "next/server";
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ key: string }> }
+) {
+  try {
+    const { key } = await params;
+    const baseUrl = process.env.API_BASE_URL || "http://api:8080";
+    const token = process.env.API_BOOTSTRAP_TOKEN;
+    
+    const response = await fetch(`${baseUrl}/settings/${key}`, {
+      headers: {
+        Authorization: `Bearer ${token}`,
+      },
+      cache: "no-store"
+    });
+
+    if (!response.ok) {
+      return NextResponse.json({ error: "Failed to fetch setting" }, { status: response.status });
+    }
+
+    const data = await response.json();
+    return NextResponse.json(data);
+  } catch (error) {
+    return NextResponse.json({ error: "Internal server error" }, { status: 500 });
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ key: string }> }
+) {
+  try {
+    const { key } = await params;
+    const baseUrl = process.env.API_BASE_URL || "http://api:8080";
+    const token = process.env.API_BOOTSTRAP_TOKEN;
+    const body = await request.json();
+    
+    const response = await fetch(`${baseUrl}/settings/${key}`, {
+      method: "POST",
+      headers: {
+        Authorization: `Bearer ${token}`,
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify(body),
+      cache: "no-store"
+    });
+
+    if (!response.ok) {
+      return NextResponse.json({ error: "Failed to update setting" }, { status: response.status });
+    }
+
+    const data = await response.json();
+    return NextResponse.json(data);
+  } catch (error) {
+    return NextResponse.json({ error: "Internal server error" }, { status: 500 });
+  }
+}