feat(skills): add Prisma and Supabase/Postgres database packs

- Prisma: prisma-database-setup, prisma-client-api, prisma-cli from
  prisma/skills (10.7K installs). Auto-detects via prisma/schema.prisma.
- Supabase & Postgres: supabase-postgres-best-practices from
  supabase/agent-skills (44.3K installs). Auto-detects via
  supabase/config.toml. Covers Postgres patterns (indexing, RLS,
  migrations) through Supabase lens.
- Add drizzle.config.ts/js to PROJECT_FILES for future ORM detection.

src/resources/extensions/gsd/detection.ts

@@ -99,6 +99,11 @@ export const PROJECT_FILES = [
   "serverless.yml",
   "serverless.yaml",
   "azure-pipelines.yml",
+  // Database / ORM config files
+  "prisma/schema.prisma",
+  "supabase/config.toml",
+  "drizzle.config.ts",
+  "drizzle.config.js",
   // React Native markers
   "metro.config.js",
   "metro.config.ts",

src/resources/extensions/gsd/skill-catalog.ts

@@ -229,6 +229,25 @@ export const SKILL_CATALOG: SkillPack[] = [
     matchLanguages: ["go"],
     matchFiles: ["go.mod"],
   },
+  // ── Database / ORM ─────────────────────────────────────────────────────────
+  {
+    label: "Prisma",
+    description: "Prisma ORM setup, schema design, client API, and migrations",
+    repo: "prisma/skills",
+    skills: [
+      "prisma-database-setup",
+      "prisma-client-api",
+      "prisma-cli",
+    ],
+    matchFiles: ["prisma/schema.prisma"],
+  },
+  {
+    label: "Supabase & Postgres",
+    description: "Supabase project setup, auth, Postgres best practices, and Firestore",
+    repo: "supabase/agent-skills",
+    skills: ["supabase-postgres-best-practices"],
+    matchFiles: ["supabase/config.toml"],
+  },
   // ── Cloud Platforms ────────────────────────────────────────────────────────
   {
     label: "Firebase",