refactor: split types.ts into domain-scoped modules (#2497)

* refactor: split types.ts into domain-scoped modules

Move types from the monolithic src/types.ts into focused
modules under src/types/: config, docker, policy, logging,
and pid. A barrel index.ts re-exports everything for full
backwards compatibility.

Closes #2475

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* feat(types): add DockerVolume interface to docker.ts and barrel re-export

Agent-Logs-Url: https://github.com/github/gh-aw-firewall/sessions/0f210f33-b44a-4f1a-b2d5-d1253403c4d7

Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

Author: 3 people