feat: OTA 附件改用 7z 压缩包（体积 -73%），客户端纯 Rust 解压

- 发布脚本：附件打包为 <binary>.7z（-mx=9）+ .7z.sha256 上传；
  同时保留裸二进制附件，v1.0.3 及更早客户端（不认识 7z）仍可升级
- update.rs：pick_assets 优先选 7z、无则回退裸二进制；
  下载 → 大小对账 + sha256 校验 → sevenz-rust 解压出二进制暂存
  （压缩包随即删除）；暂存目录清理排除 .7z
- UpdateInfo 增加 asset_name 字段区分压缩包/裸文件
- 实测 21.3MB exe → 5.8MB（7-Zip -mx=9）

Cargo.lock

@@ -632,15 +632,30 @@ dependencies = [
  "syn 2.0.119",
 ]
 
+[[package]]
+name = "bit-set"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0481a0e032742109b1133a095184ee93d88f3dc9e0d28a5d033dc77a073f44f"
+dependencies = [
+ "bit-vec 0.7.0",
+]
+
 [[package]]
 name = "bit-set"
 version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34ddef2995421ab6a5c779542c81ee77c115206f4ad9d5a8e05f4ff49716a3dd"
 dependencies = [
- "bit-vec",
+ "bit-vec 0.9.1",
 ]
 
+[[package]]
+name = "bit-vec"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2c54ff287cfc0a34f38a6b832ea1bd8e448a330b3e40a50859e6488bee07f22"
+
 [[package]]
 name = "bit-vec"
 version = "0.9.1"
@@ -1308,6 +1323,21 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crc"
+version = "3.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5eb8a2a1cd12ab0d987a5d5e825195d372001a4094a0376319d5a0ad71c1ba0d"
+dependencies = [
+ "crc-catalog",
+]
+
+[[package]]
+name = "crc-catalog"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "217698eaf96b4a3f0bc4f3662aaa55bdf913cd54d7204591faa790070c6d0853"
+
 [[package]]
 name = "crc32fast"
 version = "1.5.2"
@@ -1827,6 +1857,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "filetime_creation"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c25b5d475550e559de5b0c0084761c65325444e3b6c9e298af9cefe7a9ef3a5f"
+dependencies = [
+ "cfg-if",
+ "filetime",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.14"
@@ -3926,6 +3967,15 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "lzma-rust"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5baab2bbbd7d75a144d671e9ff79270e903957d92fb7386fd39034c709bd2661"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "mac"
 version = "0.1.1"
@@ -4153,6 +4203,7 @@ dependencies = [
  "sentry",
  "serde",
  "serde_json",
+ "sevenz-rust",
  "sha1",
  "sha2 0.10.9",
  "smol",
@@ -4175,7 +4226,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b2bf919621e7975acb27d881bae2fb993e0d45c8e0446e85e6272971e00dc8df"
 dependencies = [
  "arrayvec",
- "bit-set",
+ "bit-set 0.9.1",
  "bitflags 2.13.2",
  "cfg-if",
  "cfg_aliases",
@@ -4312,6 +4363,16 @@ dependencies = [
  "instant",
 ]
 
+[[package]]
+name = "nt-time"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2de419e64947cd8830e66beb584acc3fb42ed411d103e3c794dda355d1b374b5"
+dependencies = [
+ "chrono",
+ "time",
+]
+
 [[package]]
 name = "ntapi"
 version = "0.4.3"
@@ -6577,6 +6638,23 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sevenz-rust"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26482cf1ecce4540dc782fc70019eba89ffc4d87b3717eb5ec524b5db6fdefef"
+dependencies = [
+ "bit-set 0.6.0",
+ "byteorder",
+ "crc",
+ "filetime_creation",
+ "js-sys",
+ "lzma-rust",
+ "nt-time",
+ "sha2 0.10.9",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "sha1"
 version = "0.10.7"
@@ -8250,8 +8328,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2f519832254e56965a9940c4af57dcb75f702b6f6fa4a0b172f685395843a4d7"
 dependencies = [
  "arrayvec",
- "bit-set",
- "bit-vec",
+ "bit-set 0.9.1",
+ "bit-vec 0.9.1",
  "bitflags 2.13.2",
  "bytemuck",
  "cfg_aliases",
@@ -8322,7 +8400,7 @@ dependencies = [
  "android_system_properties",
  "arrayvec",
  "ash",
- "bit-set",
+ "bit-set 0.9.1",
  "bitflags 2.13.2",
  "block2 0.6.2",
  "bytemuck",