feat: customize stop signal and refactor config types

[gaojunran]

No description provided.

[greptile-apps]

Greptile Summary

This PR introduces customizable stop signals via the new StopSignal/StopConfig types, and refactors several previously inline config types (Retry, PortBump, PortConfig, WatchMode, CronRetrigger, Dir, etc.) into a dedicated src/config_types.rs module. The --auto-bump-port CLI flag is renamed to --bump and the previously broken optional-value form is fixed by adding num_args = 0..=1.

Confidence Score: 5/5

Safe to merge — one P2 style cleanup in pitchfork.toml, no functional issues.

All P1 issues from previous review rounds are addressed. Core logic for signal dispatch, serialization, and config migration is sound.

pitchfork.toml — still mixes deprecated and new port config fields for the docs daemon

Important Files Changed

Filename	Overview
src/config_types.rs	New file extracting config value types (StopSignal, StopConfig, Retry, PortBump, PortConfig, etc.) from pitchfork_toml.rs — clean design with BoolOrU32 and StringOrStruct traits, correct serde and JsonSchema impls.
pitchfork.toml	docs daemon retains deprecated top-level fields alongside the new [daemons.docs.port] section; triggers deprecation warning at every start.
src/supervisor/lifecycle.rs	stop() now reads configured stop_signal from daemon state and passes it through kill_process_group_async; logic is correct.
src/cli/config/add.rs	auto-bump-port renamed to --bump; num_args = 0..=1 added so bare --bump now maps correctly to Some(None).
src/procs.rs	kill_process_group and kill now accept a configurable stop_signal and optional per-daemon timeout, replacing the hardcoded SIGTERM.
src/pitchfork_toml.rs	Re-exports config types from new config_types.rs module; stop_signal properly threaded through read/write paths.
src/supervisor/watchers.rs	Watcher restart path now reads stop_signal from daemon state and uses it for kill_process_group_async.

_{Reviews (8): Last reviewed commit: "[autofix.ci] apply automated fixes" | Re-trigger Greptile}

[gaojunran]

@jdx ready for a review!