feat: Add organization logo upload

- Add uploads router with logo upload/delete/serve endpoints
- Add logo_url column migration for organizations table
- Update /organizations/current to include logo_url
- Max 5MB, supports JPG/PNG/WebP/SVG

src/db/postgres.ts

@@ -29,11 +29,28 @@ export async function initDB(): Promise<void> {
   try {
     const result = await client.queryObject`SELECT NOW()`;
     console.log("✅ Database connected:", result.rows[0]);
+    
+    // Run migrations
+    await runMigrations(client);
   } finally {
     client.release();
   }
 }
 
+async function runMigrations(client: ReturnType<Pool["connect"]> extends Promise<infer T> ? T : never): Promise<void> {
+  // Add logo_url column to organizations if not exists
+  try {
+    await client.queryObject`
+      ALTER TABLE organizations 
+      ADD COLUMN IF NOT EXISTS logo_url TEXT
+    `;
+    console.log("✅ Migration: logo_url column checked");
+  } catch (e) {
+    // Column might already exist, that's fine
+    console.log("ℹ️ Migration note:", e instanceof Error ? e.message : String(e));
+  }
+}
+
 export function getPool(): Pool {
   return pool;
 }