feat(prompts): add works best with feature for prompts

prisma/migrations/20260109064746_add_works_best_with/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "prompts" ADD COLUMN     "bestWithMCP" JSONB,
+ADD COLUMN     "bestWithModels" TEXT[];

prisma/schema.prisma

@@ -124,6 +124,8 @@ model Prompt {
   outgoingConnections PromptConnection[] @relation("ConnectionSource")
   incomingConnections PromptConnection[] @relation("ConnectionTarget")
   collectedBy         Collection[]
+  bestWithModels      String[]           // Model slugs this prompt works best with (max 3), e.g. ["gpt-4o", "claude-3-5-sonnet"]
+  bestWithMCP         Json?              // MCP configs array, e.g. [{command: "npx -y @mcp/server", tools: ["tool1"]}]
 
   @@index([authorId])
   @@index([categoryId])