feat(cli): rename source API command to api

[lentil32]

One-Line Summary

Rename the top-level source API command from onequery use to onequery api across the CLI, generated examples, and adapter descriptors.

User-Facing Changes

• onequery api is now the canonical top-level source API command.
• CLI help, retry guidance, and snapshots now reference onequery api instead of onequery use.
• Generated source API examples from the CLI server and server adapters now emit onequery api ... commands.
• onequery org use remains unchanged.

Why This Changed

• The top-level use verb was too generic and easy to confuse with other command surfaces, especially org use.
• The old command name was embedded in clap parsing, help text, retry hints, shared CLI example builders, and server-side adapter examples, so a partial rename would leave inconsistent guidance.
• This change replaces the command in place and intentionally keeps no backward compatibility alias so the CLI has one deterministic source API command name.

How It Changed

• Replaced the top-level clap/model wiring in apps/cli from Use/UseArgs to Api/ApiArgs.
• Updated command-path reporting, usage text, parser tests, and snapshots so the CLI advertises onequery api.
• Updated source API rendering and error guidance so dry-run output, retry hints, and examples all reference onequery api.
• Renamed shared CLI example helpers in packages/cli-server from buildCliUse* to buildCliApi*.
• Replaced server adapter example commands in packages/server so descriptor-driven examples stay aligned with the parser.
• Updated the local just helper from use to api.

Extra Context / Decisions (Optional)

• No backward compatibility layer was added.
• README unchanged.

Verification

• bun run format
• just fmt
• cargo test -p onequery-cli
• bun run --cwd packages/cli-server test -- src/cli-defaults.test.ts src/connect/service/source_api.test.ts
• bun run --cwd packages/server test -- src/source-api/adapters/amplitude.test.ts src/source-api/adapters/github.test.ts src/source-api/adapters/ga.test.ts src/source-api/adapters/mongodb.test.ts src/source-api/adapters/mixpanel.test.ts src/source-api/adapters/posthog.test.ts src/source-api/adapters/sentry.test.ts

Video / Screenshot (Optional)

• N/A