test(backend): add unit coverage for deployment fixtures, env template generator, supabase lock, and server client factory

[tegaReed-crypto]

Summary

Adds co-located unit test suites for four backend utilities that previously had no dedicated test coverage:

• apps/backend/src/lib/deployment-fixtures.test.ts
• apps/backend/src/lib/env/env-template-generator.test.ts
• apps/backend/src/lib/supabase/supabase-lock.test.ts
• apps/backend/src/lib/supabase/server.test.ts

Changes

deployment-fixtures.test.ts

• Verifies MOCK_DEPLOYMENTS array shape and required fields.
• Confirms valid environments, triggers, and date formatting.
• Asserts MOCK_ANALYTICS has sensible defaults.

env-template-generator.test.ts

• Covers target scoping for all supported Vercel targets (production/preview/development).
• Validates secret vs plain variable classification.
• Tests family-specific overrides and config-driven entry generation.

supabase-lock.test.ts

• Mocks the Supabase client RPC layer.
• Verifies hashKey determinism and distinct-key non-collision.
• Covers immediate lock acquisition, polling success, timeout returning false, and RPC error throwing.

server.test.ts

• Mocks next/headers and @supabase/ssr.
• Asserts client creation reads from expected environment variables.
• Confirms missing required env vars throws clear errors.

Test Plan

Run the targeted backend test suites:

npm run test --workspace=@craft/backend -- deployment-fixtures
npm run test --workspace=@craft/backend -- env-template-generator
npm run test --workspace=@craft/backend -- supabase-lock
npm run test --workspace=@craft/backend -- lib/supabase/server

Issues Closed

Closes #1083
Closes #1084
Closes #1085
Closes #1086

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