feat: add public org icon serving endpoint with default fallback

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

apps/api/src/routers/public.ts

@@ -1,4 +1,5 @@
 import type { Database, Tables } from "@xtablo/shared-types";
+import type { S3Client } from "@aws-sdk/client-s3";
 import { Hono } from "hono";
 import { createFactory } from "hono/factory";
 import {
@@ -10,6 +11,7 @@ import {
   type TimeSlot,
   type WeeklyAvailability,
 } from "../helpers/slots.js";
+import { getOrgIcon } from "../helpers/orgIcons.js";
 import type { BaseEnv } from "../types/app.types.js";
 
 // import { MiddlewareManager } from "../middlewares/middleware.js";
@@ -125,10 +127,52 @@ const getPublicSlots = factory.createHandlers(async (c) => {
   });
 });
 
+const getOrgIconHandler = factory.createHandlers(async (c) => {
+  const orgIdStr = c.req.param("orgId");
+  const filename = c.req.param("filename");
+  const orgId = Number.parseInt(orgIdStr, 10);
+
+  if (Number.isNaN(orgId) || !filename) {
+    return c.json({ error: "Invalid request" }, 400);
+  }
+
+  // Parse filename: "icon-192.png" or "icon-512-maskable.png"
+  const match = filename.match(/^icon-(\d+)(-maskable)?\.png$/);
+  if (!match) {
+    return c.json({ error: "Invalid icon filename" }, 400);
+  }
+
+  const size = Number.parseInt(match[1], 10);
+  const maskable = !!match[2];
+
+  const s3Client = c.get("s3_client") as S3Client;
+  const result = await getOrgIcon(s3Client, orgId, size, maskable);
+
+  if (!result) {
+    // Fallback: redirect to default PWA icon
+    const defaultPath = maskable
+      ? "/pwa-icons/pwa-512x512-maskable.png"
+      : size <= 32
+        ? `/pwa-icons/favicon-${size}x${size}.png`
+        : size === 180
+          ? "/pwa-icons/apple-touch-icon-180x180.png"
+          : `/pwa-icons/pwa-${size}x${size}.png`;
+    return c.redirect(defaultPath, 302);
+  }
+
+  return new Response(result.buffer, {
+    headers: {
+      "Content-Type": result.contentType,
+      "Cache-Control": "public, max-age=86400",
+    },
+  });
+});
+
 export const getPublicRouter = () => {
   const publicRouter = new Hono<BaseEnv>();
 
   publicRouter.get("/slots/:shortUserId/:standardName", ...getPublicSlots);
+  publicRouter.get("/org-icons/:orgId/:filename", ...getOrgIconHandler);
 
   return publicRouter;
 };