feat(bundles): add editorial bundle plugins

plugins/antigravity-bundle-full-stack-developer/skills/database-design/database-selection.md

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+# Database Selection (2025)
+
+> Choose database based on context, not default.
+
+## Decision Tree
+
+```
+What are your requirements?
+│
+├── Full relational features needed
+│   ├── Self-hosted → PostgreSQL
+│   └── Serverless → Neon, Supabase
+│
+├── Edge deployment / Ultra-low latency
+│   └── Turso (edge SQLite)
+│
+├── AI / Vector search
+│   └── PostgreSQL + pgvector
+│
+├── Simple / Embedded / Local
+│   └── SQLite
+│
+└── Global distribution
+    └── PlanetScale, CockroachDB, Turso
+```
+
+## Comparison
+
+| Database | Best For | Trade-offs |
+|----------|----------|------------|
+| **PostgreSQL** | Full features, complex queries | Needs hosting |
+| **Neon** | Serverless PG, branching | PG complexity |
+| **Turso** | Edge, low latency | SQLite limitations |
+| **SQLite** | Simple, embedded, local | Single-writer |
+| **PlanetScale** | MySQL, global scale | No foreign keys |
+
+## Questions to Ask
+
+1. What's the deployment environment?
+2. How complex are the queries?
+3. Is edge/serverless important?
+4. Vector search needed?
+5. Global distribution required?