fix: add migrations directory to D1 + Drizzle template to prevent ENOENT on dev

[shkumbinhasani]

Summary

• Adds an empty migrations/.gitkeep to the db package template so packages/db/src/migrations exists after scaffolding
• Fixes ENOENT crash when running bun run dev with D1 + Drizzle + Alchemy setup

Closes #999

Problem

Bun's fs.glob throws ENOENT when the target directory doesn't exist (unlike Node.js which returns empty). Alchemy's D1Database globs for *.sql files in the migrations directory, which crashes before the user has a chance to run db:generate.

Test plan

• Scaffold a new project with D1, Drizzle, and Alchemy options
• Run bun run dev immediately — should no longer crash

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[coderabbitai]

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• packages/template-generator/templates/db/drizzle/sqlite/src/migrations/.gitkeep

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Reviewing files that changed from the base of the PR and between c38bcc0 and d1074ff.

📒 Files selected for processing (1)

• packages/template-generator/templates/db/drizzle/sqlite/src/migrations/.gitkeep

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