fix(#381): add WAL backup configuration guard

[DevSolex]

Summary

Configures a startup guard for PostgreSQL WAL archiving to prevent permanent data loss on storage failure.

Changes

• src/config/env.ts — adds PG_WAL_BACKUP_CONFIGURED (bool) and PG_WAL_BACKUP_PROVIDER (label) env vars, exposed on config.walBackup
• src/config/database.ts — connectWithRetry() refuses to start in production when PG_WAL_BACKUP_CONFIGURED !== "true"; logs backup status on every boot
• .env.example — documents both vars with examples
• tests/walBackup.test.ts — 4 tests: throws when unset (prod), throws when false (prod), connects when true (prod), passes in dev

Testing

PASS tests/walBackup.test.ts
  #381 WAL backup guard
    ✓ throws in production when PG_WAL_BACKUP_CONFIGURED is not set
    ✓ throws in production when PG_WAL_BACKUP_CONFIGURED=false
    ✓ connects successfully in production when PG_WAL_BACKUP_CONFIGURED=true
    ✓ does not throw in development when PG_WAL_BACKUP_CONFIGURED is not set

Closes #381

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