refactor: replace hardcoded database ID with environment variable

[jezweb]

Problem

The D1 database ID was hardcoded in drizzle.config.ts, making it difficult to:

• Switch between different databases (dev/staging/prod)
• Set up the project for new developers
• Use different database instances per environment

Solution

Replace the hardcoded ID with CLOUDFLARE_D1_DATABASE_ID environment variable.

Changes

• drizzle.config.ts: Use process.env.CLOUDFLARE_D1_DATABASE_ID instead of hardcoded value
• .dev.vars.example: Add CLOUDFLARE_D1_DATABASE_ID with instructions
• README.md: Document the new environment variable in multiple places:
  • Quick setup section
  • Manual setup section
  • D1 database creation instructions
  • GitHub Actions secrets list

Impact

Developers can now easily configure different database instances per environment without modifying code. The wrangler.jsonc file still requires the actual database_id value as Wrangler doesn't support env var interpolation in config files.

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📥 Commits

Reviewing files that changed from the base of the PR and between a44687a and b5c79d7.

📒 Files selected for processing (4)

• .dev.vars.example (1 hunks)
• PROJECT_BRIEF.md (1 hunks)
• README.md (4 hunks)
• drizzle.config.ts (1 hunks)

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[ifindev]

We don't need this file, can you remove it?