feat(domain): pure business logic for parsing, identity, slots, acquisition, paths, organize, download state (W1-2)

- release-parser: title/file/dir parsing with MP parity + deviations (airDate/issue,
  cut, release group suffix fallback, dir+file merge, safe episode offset)
- identity: title normalization (NFKC, trad->simp map, season suffix) and
  evidence-level candidate ranking (year tolerance ±1, no probabilities)
- slot: hard/soft/upgrade evaluation (missing vs unmet fields), state machine,
  movie/unit completion (season pack must be covered by actual file list)
- acquisition: new_title/catch_up/upgrade modes, priority order, budget,
  cache volume hard threshold with resume watermark (no double counting)
- path: immutable path bindings, restricted naming templates, sanitize,
  conflict detection, downloader<->host path mapping
- organize: planOrganize with sidecar pairing, sample exclusion, existing
  target policy, crossDevice marking, H&R -> conflict for move
- download-state: qB state mapping, completion, no-progress evidence

230 tests, ~97% statement coverage.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

packages/domain/src/index.ts

@@ -1,2 +1,10 @@
-// @umt/domain 公开入口;W1 起在此导出实现
+// @umt/domain 公开入口:纯业务逻辑,无 IO。模块地图与不变量见 packages/domain/README.md
 export const PACKAGE_NAME = "@umt/domain";
+
+export * from "./acquisition";
+export * from "./download-state";
+export * from "./identity";
+export * from "./organize";
+export * from "./path";
+export * from "./release-parser";
+export * from "./slot";