test(users): userRepository coverage

[JojoFlex1]

• Uniqueness constraints: duplicate stellar_address on create and update
• Input validation: empty/whitespace stellarAddress and id fields
• Whitespace trimming: stellarAddress trimmed before persistence
• DTO shape: camelCase fields only, no snake_case column leakage
• createdAt is a proper Date instance, not a raw string
• list edge cases: empty table, offset beyond total, snake_case list shape
• Fix: replaced gen_random_uuid counter with node:crypto randomUUID
• Fix: wrap pool query to pass explicit UUID on INSERT, working around pg-mem 3.x global function registration bug
• Security note: no PII in test data, all addresses are synthetic Stellar-format strings
  close Repositories: userRepository tests (lookup + uniqueness assumptions) #148

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[JojoFlex1]

Note: src/lib/prisma.ts line 17 has a pre-existing no-require-imports lint error that predates this branch see commits 5a46be9, caa57cd. Fixing it breaks typecheck due to @prisma/client export resolution. Left out of scope tracked separately

[JojoFlex1]

Test output: 24 passed, 0 failed
Note: CI failures are pre-existing test:integration and test:coverage scripts don't exist in package.json, and multiple unrelated test files fail due to missing database/env setup in CI.
Security note: No PII in test data al l addresses are synthetic Stellar-format strings.
Data integrity note: Uniqueness constraints validated at unit level via pg-mem.

[JojoFlex1]

could you please merge my pr