Add ability to upload and apply custom logos to social media posts

Implement functionality for uploading, applying, and deleting custom logos as overlays on images, along with backend processing and UI updates.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Event-Id: 91999614-5187-4902-b7a1-bf9e372de9c8
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/JgqpaNl

shared/schema.ts

@@ -36,6 +36,7 @@ export const cloudinaryConfig = pgTable("cloudinary_config", {
   cloudName: text("cloud_name").notNull(),
   apiKey: text("api_key").notNull(),
   apiSecret: text("api_secret").notNull(),
+  logoPublicId: text("logo_public_id"),
   createdAt: timestamp("created_at").defaultNow(),
   updatedAt: timestamp("updated_at").defaultNow(),
 });