feat: add customizable business branding (name, logo, colors)

Add admin settings for business branding with name, logo upload, and
color scheme via CSS custom properties. Includes database migration,
API endpoints, admin settings page, and dynamic branding in both
admin nav and customer portal.

Closes #61

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/db/migrations/0008_business_settings.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS "business_settings" (
+  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+  "business_name" text DEFAULT 'GroomBook' NOT NULL,
+  "logo_base64" text,
+  "logo_mime_type" text,
+  "primary_color" text DEFAULT '#4f8a6f' NOT NULL,
+  "accent_color" text DEFAULT '#8b7355' NOT NULL,
+  "created_at" timestamp DEFAULT now() NOT NULL,
+  "updated_at" timestamp DEFAULT now() NOT NULL
+);
+
+-- Seed a default row so GET always returns something
+INSERT INTO "business_settings" ("business_name", "primary_color", "accent_color")
+VALUES ('GroomBook', '#4f8a6f', '#8b7355')
+ON CONFLICT DO NOTHING;

packages/db/src/schema.ts

@@ -218,6 +218,17 @@ export const reminderLogs = pgTable(
   (t) => [unique().on(t.appointmentId, t.reminderType)]
 );
 
+export const businessSettings = pgTable("business_settings", {
+  id: uuid("id").primaryKey().defaultRandom(),
+  businessName: text("business_name").notNull().default("GroomBook"),
+  logoBase64: text("logo_base64"),
+  logoMimeType: text("logo_mime_type"),
+  primaryColor: text("primary_color").notNull().default("#4f8a6f"),
+  accentColor: text("accent_color").notNull().default("#8b7355"),
+  createdAt: timestamp("created_at").notNull().defaultNow(),
+  updatedAt: timestamp("updated_at").notNull().defaultNow(),
+});
+
 export const groomingVisitLogs = pgTable("grooming_visit_logs", {
   id: uuid("id").primaryKey().defaultRandom(),
   petId: uuid("pet_id")

packages/types/src/index.ts

@@ -145,6 +145,17 @@ export interface Invoice {
   tipSplits?: InvoiceTipSplit[];
 }
 
+export interface BusinessSettings {
+  id: string;
+  businessName: string;
+  logoBase64: string | null;
+  logoMimeType: string | null;
+  primaryColor: string;
+  accentColor: string;
+  createdAt: string;
+  updatedAt: string;
+}
+
 // Paginated list response
 export interface PaginatedList<T> {
   items: T[];