feat(m190): 产物署名（PE VERSIONINFO）+ 清单 Ed25519 多签名与更新前验签

两件事：让「这是谁发的」在产物与清单上都留下可验证的痕迹。

① PE 版本资源（两个 bin）：`packaging/pe_version.rs` 是唯一口径（CompanyName
   「Unlucky Launcher Project」/ ProductName、FileDescription「Unlucky Launcher」/
   LegalCopyright「© 2026 … · Apache-2.0」/ 四段式版本号与 Cargo.toml 同源），被
   `crates/{cli,app-iced}/build.rs` 各 include 一次；非 windows 目标整段不执行。
   判据是读产物字节的 `packaging/check_pe_version.py`（CI 的 Windows 槽位）。

② 清单签名：`manifest.json` 旁边多一份 `manifest.json.sig`（分离签名，签的是清单**原始
   字节**），信封是 `{format, signatures:[{alg,key_id,sig,manifest_sha256}]}` —— 多签名数组，
   任意一条命中钉住的钥即放行（换钥窗口）。信任锚是 `crates/core/src/update/trust.rs`
   里的编译期公钥表（正式表为空 = fail-closed，测试钥只在 cfg(test)/update-test-source 里）。
   管线顺序改成「先验签、再解析」：`UpdateSource` 只交原文 + `.sig`，`verified_manifest`
   是唯一收口点，`Job::apply` 因此在取包**之前**就拒。新增五类错误分类
   （signature_missing / malformed / unknown_key / keyring_empty / invalid ），全部不可重试，
   CLI 的 hint 单独说人话。

③ Ed25519 验签自带实现（`update/ed25519/*`，零新依赖）：scope 不含 core 的 Cargo.toml，
   用 RFC 8032 §7.1 向量 + 可锻/小阶/非规范编码的拒绝用例钉住；签名侧是
   `packaging/sign_manifest.py`（纯 Python 参考实现，零 pip 依赖，`--self-test` 同向量）。

④ 守门：`release-publish.yml` 加签名步（`set +x`，只回显公钥；没 Secret / 钥没钉 / 签不上
   一律红 ⇒ 不出 Release）；`release-build.yml` 加 PE 资源读回；`release-guard.yml` 跑两个
   脚本的 `--self-test`。密钥纪律与轮换（旧钥签新钥）写在 `packaging/docs/signing.md`。

Cargo.lock：新增 winresource（build-dependency）与 toml 系；toml_datetime 1.1.2→1.1.3 是
toml 1.2.1 的硬要求（`cargo update --precise 1.1.2` 已实测被拒）。

Cargo.lock

@@ -4125,6 +4125,15 @@ dependencies = [
  "syn 3.0.9",
 ]
 
+[[package]]
+name = "serde_spanned"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c187e0a369471c550af028cba56d4f4fa2a489ad28151ae95a4d340a2a8b782"
+dependencies = [
+ "serde_core",
+]
+
 [[package]]
 name = "serde_urlencoded"
 version = "0.7.1"
@@ -4739,10 +4748,25 @@ dependencies = [
 ]
 
 [[package]]
-name = "toml_datetime"
-version = "1.1.2+spec-1.1.0"
+name = "toml"
+version = "1.1.0+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b86d767906c6c42421dcba507eb9d203e779497710a47782a224bb871653053"
+checksum = "f8195ca05e4eb728f4ba94f3e3291661320af739c4e43779cbdfae82ab239fcc"
+dependencies = [
+ "indexmap",
+ "serde_core",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_parser",
+ "toml_writer",
+ "winnow",
+]
+
+[[package]]
+name = "toml_datetime"
+version = "1.1.3+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "173f25c883cd2176a2d8212155638c0a60d484a9d84546d270866f40f56b6e49"
 dependencies = [
  "serde_core",
 ]
@@ -4768,6 +4792,12 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "toml_writer"
+version = "1.2.0+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "009dbb7700f11c55ef83aebbe4c0e9cf1f1ac0844bd8d6f00dc38f302026e13a"
+
 [[package]]
 name = "tower"
 version = "0.5.3"
@@ -5007,6 +5037,7 @@ dependencies = [
  "unlucky-design",
  "unlucky-i18n",
  "unlucky-presenter",
+ "winresource",
 ]
 
 [[package]]
@@ -5018,6 +5049,7 @@ dependencies = [
  "tokio",
  "unlucky-agent",
  "unlucky-core",
+ "winresource",
 ]
 
 [[package]]
@@ -5968,6 +6000,16 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winresource"
+version = "0.1.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2bc6d36480b829272a5bdabf08e6dca8004761c1da7e35efef800540c66221b"
+dependencies = [
+ "toml",
+ "version_check",
+]
+
 [[package]]
 name = "wit-bindgen"
 version = "0.57.1"