feat: inject daemon running info to tera template

[gaojunran]

addresses #405.

[greptile-apps]

Greptile Summary

This PR adds Tera template support to pitchfork.toml config fields (run, env, hooks.*, ready_cmd), letting daemons reference resolved ports and metadata from their dependencies via {{ daemons.redis.port }} syntax. Templates are rendered level-by-level in batch.rs and re-rendered at hook fire time from state file data, with a TemplateRenderer struct that reuses a single Tera instance per daemon. The two P1 issues from the previous review round (already-running daemons missing from resolved_ports_map, and hook render errors fatally blocking startup) are both addressed in this revision.

Confidence Score: 5/5

Safe to merge; only P2 findings remain.

No P0 or P1 issues found. The two previously flagged P1s are correctly resolved. Remaining findings are a per-daemon read_global_slugs() call (avoidable but not a correctness issue) and an inaccurate doc comment about when hook template warnings are emitted.

src/template.rs — minor doc comment inaccuracy and per-invocation disk I/O in the constructor.

Important Files Changed

Filename	Overview
src/template.rs	New module: Tera template engine integration with TemplateContext, render_template, and render_daemon_templates. Has a per-daemon read_global_slugs() call (disk I/O) inside the constructor, and a doc comment that misrepresents when hook warnings are logged.
src/ipc/batch.rs	Level-by-level template rendering integrated correctly; running daemons' ports are now added to resolved_ports_map before continue, fixing the previously flagged issue where already-running levels would leave next-level templates without port context.
src/supervisor/hooks.rs	Adds render_hook_template using state file data at fire time. Hook template errors log a warning and return early, matching documented behaviour. fire_output_hook also gains template rendering.
src/pitchfork_toml.rs	Extracts slug-lookup logic into find_slug_for_daemon_in_registry; Err(_) => true fallback (name-only match when namespace can't be resolved) is preserved, consistent with the original list.rs behaviour.
docs/guides/configuration-templates.md	New documentation page covering template syntax, variables, resolution order, and error handling; content is accurate with respect to the implementation.

_{Reviews (4): Last reviewed commit: "fix(template): address minor tera render..." | Re-trigger Greptile}