feat(enhance): config, templates, ComfyUI client, jobs, endpoints (#192)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/enhance/mod.rs

@@ -0,0 +1,25 @@
+//! Enhance on demand (#192): run a ComfyUI restore/edit workflow on a photo
+//! from the apps, approve the result in-app, and have it land in the library
+//! as a version (#191).
+//!
+//! - [`config`]: `enhance.toml` (templates, path map, timings).
+//! - [`template`]: workflow loading/validation and per-photo filling.
+//! - [`comfy`]: the ComfyUI HTTP calls used.
+//! - [`service`]: submit, poll, approve, idle `/free`.
+//! - [`handlers`]: the HTTP endpoints.
+//!
+//! ImageApi never writes under a library root: ComfyUI writes the approved
+//! file, ImageApi only ingests it.
+
+pub mod comfy;
+pub mod config;
+pub mod handlers;
+pub mod path_map;
+pub mod service;
+pub mod template;
+
+#[cfg(test)]
+mod integration_tests;
+
+pub use handlers::{approve, discard, get_job, get_templates, list_jobs, preview, submit};
+pub use service::EnhanceService;