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/identity/normalize.ts

@@ -0,0 +1,37 @@
+import { CN_NUM } from "../release-parser/cn-number";
+import { toSimplified } from "./zh-map";
+
+const SEASON_SUFFIX = [
+  new RegExp(`\\s*第\\s*${CN_NUM}\\s*[季部]\\s*$`, "u"),
+  /\s*[:：-]?\s*(?:season|series)\s*\d+\s*$/iu,
+  /\s+S\d{1,2}\s*$/iu,
+  /\s*[(（]\s*(?:19|20)\d{2}\s*[)）]\s*$/u,
+];
+
+/** 去掉标题末尾的季号/年份后缀("庆余年 第二季"、"Show Season 2"、"Title (2019)") */
+export function stripSeasonSuffix(s: string): string {
+  let out = s.trim();
+  for (let changed = true; changed; ) {
+    changed = false;
+    for (const re of SEASON_SUFFIX) {
+      const next = out.replace(re, "");
+      if (next !== out && next.trim().length > 0) {
+        out = next.trim();
+        changed = true;
+      }
+    }
+  }
+  return out;
+}
+
+/**
+ * 标题归一化(用于比较,不用于展示):
+ * 全角→半角(NFKC)、繁→简、小写、& → and、去季号后缀、去标点与空白。
+ */
+export function normalizeTitle(s: string): string {
+  const base = stripSeasonSuffix(toSimplified(s.normalize("NFKC")));
+  return base
+    .toLowerCase()
+    .replace(/&/g, "and")
+    .replace(/[^\p{L}\p{N}]+/gu, "");
+}