fix: release QA hardening across processing, media, security, and CI gates (#649)

A release-readiness QA pass over the whole product. The commits split into
defects a user would hit and gates that were reporting green while measuring
nothing.

## Fixes that change behaviour

Rate limiting was bypassable on every install: TRUST_PROXY defaulted to true, so
request.ip came from a client-set header and a forged X-Forwarded-For got past
the login limiter. The default is now a private-network trust list.

A transient Postgres outage stranded in-flight jobs, leaving finished output on
disk with no row pointing at it. A reconciler now resolves those rows and adopts
the bytes rather than dropping the work.

A Redis connection that moved to a new address wedged every read-blocked
consumer, so completions stopped signalling while health still answered 200.
Socket timeouts plus subscriber pings recover it.

Installing more than one AI bundle left the shared venv multi-versioned and
silently broke three tools. The installer now reconciles distributions to one
version each.

Converting an image to JXL at quality 1 through 4 returned a 500, because
libjxl 0.7 rejects the distance those values compute. The quality is floored at
what the encoder honours. A missing ffmpeg was also reported to the user as a
corrupt upload; it now says the engine is unavailable.

RAW uploads reached an unpatched LibRaw on arm64, so it is built from source at
0.22.2, and the release scan was split so it can fail on an unfixed critical
instead of hiding it behind ignore-unfixed.

## Gates that could not fail

Two mutation lanes ran zero mutants because Stryker crawled the gitignored docs
build; coverage discarded its whole report on any failing test; the lint gate
skipped root tests, scripts, and two workspaces; and several generated matrices
counted a host missing ffmpeg as a passing tool. Each now measures what it
claims.

Full evidence and the outstanding release items are tracked locally and are not
part of this branch.

apps/docs/zh-CN/guide/developer.md

@@ -1,8 +1,9 @@
 ---
 description: "本地开发环境搭建、命令、代码约定，以及如何为 SnapOtter 添加新工具。"
-i18n_source_hash: cb03724d2829
-i18n_provenance: human
-i18n_output_hash: c9c7c992d6d7
+i18n_source_hash: 56acc1bf9a9b
+i18n_provenance: machine
+i18n_output_hash: 064e6879f3bb
+i18n_hash_version: 2
 ---
 
 # 开发者指南 {#developer-guide}
@@ -11,12 +12,12 @@ i18n_output_hash: c9c7c992d6d7
 
 ## 前置条件 {#prerequisites}
 
-- [Node.js](https://nodejs.org/) 22+
+- [Node.js](https://nodejs.org/) 22.22+
 - [pnpm](https://pnpm.io/) 9+（`corepack enable && corepack prepare pnpm@latest --activate`）
 - [Docker](https://www.docker.com/)（本地 Postgres + Redis、容器构建和 AI 功能所必需）
 - Git
 
-仅当你在开发 AI/ML sidecar（背景移除、放大、OCR）时才需要 Python 3.10+。
+仅当你在开发 AI/ML sidecar（背景移除、放大、OCR）时才需要 Python 3.11+。
 
 ## 搭建环境 {#setup}
 
@@ -32,10 +33,10 @@ pnpm dev
 
 | 服务  | URL                      | 备注                              |
 |----------|--------------------------|------------------------------------|
-| 前端 | http://localhost:1349     | Vite 开发服务器，代理 /api      |
+| 前端 | http://localhost:1351     | Vite 开发服务器，代理 /api      |
 | 后端  | http://localhost:13490    | Fastify API（通过代理访问）   |
 
-在浏览器中打开 http://localhost:1349。使用 `admin` / `admin` 登录。首次登录时会提示你修改密码。
+在浏览器中打开 http://localhost:1351。使用 `admin` / `admin` 登录。首次登录时会提示你修改密码。
 
 ## 项目结构 {#project-structure}
 
@@ -220,6 +221,17 @@ docker build -f docker/Dockerfile -t snapotter:latest .
 DOCKER_BUILDKIT=1 docker build -f docker/Dockerfile -t snapotter:latest .
 ```
 
+## 发布版本域 {#release-version-domains}
+
+SnapOtter 有意具有三个版本域。发布期间请勿将一个域复制到另一个域：
+
+- 应用程序发布版本涵盖根清单、所有私有工作区包和 `APP_VERSION`。 Semantic-release 提供此值，`pnpm version:sync <version>` 在应用程序发布之前更新每个工作区。
+- OpenAPI `info.version` 是稳定的公开 API-主力合约。所有本地化规范都保留在 `<major>.0.0` 上以实现兼容的应用程序版本，并且仅当 API 合约转移到新的主要版本时才会更改。
+- `docker/feature-manifest.json` 保留 `imageVersion: 2.0.0` 作为不可变的旧功能包存储时代。这些 v2 存档路径不是应用程序包版本。准确的 OCR 使用运行时格式 v3 并单独记录其应用程序发布来源。
+
+`tests/unit/infra/release-version-policy.test.ts` 强制执行这些边界。新版本的域或迁移必须一起更新该合同和相关的工件迁移设计。
+独立的 API 和旧包值位于 `config/release-version-policy.json` 中；应用程序版本同步绝不能隐式重写该策略文件。
+
 ## 环境变量 {#environment-variables}
 
 完整列表请参见 [配置指南](/zh-CN/guide/configuration)。开发中的关键项：