[Claude] 4.1: Add SerenDB API integration tests

[taariq]

Parent: #28

Depends on: All Phase 1-3 tasks

Task

Create integration tests for SerenDB API in tests/serendb_api_test.rs.

File to Create

tests/serendb_api_test.rs

What to Add

Integration tests that can run against a real SerenDB API:

• test_list_projects - Verify projects can be listed
• test_list_branches - Verify branches can be listed
• test_get_connection_string - Verify connection string is valid

Tests should be marked #[ignore] and require:

• SEREN_API_KEY environment variable
• TEST_SERENDB_PROJECT_ID environment variable

See docs/plans/api-key-flow-implementation.md Task 4.1 for full code.

How to Test

export SEREN_API_KEY=seren_xxx
export TEST_SERENDB_PROJECT_ID=your-project-id
cargo test --test serendb_api_test -- --ignored --nocapture

Commit Message

test: Add SerenDB API integration tests

[taariq]

Integration tests created in tests/serendb_api_test.rs with 9 tests covering list_projects, get_project, list_branches, get_default_branch, list_databases, get_connection_string, is_logical_replication_enabled, and error handling for invalid API keys and nonexistent projects.