🚀 The SaaS Template Playbook 📖 A comprehensive, opinionated, actionable guide for building a professional, reusable SaaS template that you can fork and reskin for any vertical (CRM, project management, analytics, internal tooling, vertical SaaS, etc.). If you read only one section first, read §3 The 12 Pillars and §5 Multi-Tenancy — those two ideas dictate every other decision in this document. 📋 Table of Contents 🧐 What "SaaS Template" Actually Means ⚡ The 30-Second Mental Model 🏛️ The 12 Pillars of a Production SaaS 🏗️ Reference Architecture 🏢 Multi-Tenancy — the Keystone Decision 🔐 Authentication & Authorization 👥 Accounts, Organizations, Workspaces, Teams 🚪 Onboarding & Activation 💳 Billing, Subscriptions & Metering 🗄️ Database Design Patterns 🌐 API Design ⚙️ Background Jobs, Queues & Schedulers 📡 Real-time & Eventing 📨 Email, Notifications & Inbox 📦 File Storage, Uploads & CDN 🔎 Search (Full-Text + Semantic) 🚩 Feature Flags & Experiments 📊 Audit Logs,…