fix(ci): align master libsodium config with beta to resolve merge conflict

PR #105 (beta) and PR #106 (master) independently fixed libsodium detection
using different approaches, causing conflicts on every auto master→beta merge.

Adopt beta's proven approach in auto-tag.yml and release-beta.yml:
- linux-amd64: use SODIUM_LIB_DIR env var, remove runtime apt-get install
- linux-arm64: use SODIUM_LIB_DIR / extended PKG_CONFIG_PATH, remove apt-get
- windows: keep SODIUM_STATIC, add SODIUM_USE_PKG_CONFIG=no

.gitea/workflows/auto-tag.yml

@@ -344,8 +344,8 @@ jobs:
       - name: Build
         env:
           APPIMAGE_EXTRACT_AND_RUN: "1"
+          SODIUM_LIB_DIR: /usr/lib/x86_64-linux-gnu
         run: |
-          apt-get update -qq && apt-get install -y --no-install-recommends libsodium-dev
           npm ci --legacy-peer-deps
           CI=true npx tauri build --target x86_64-unknown-linux-gnu
       - name: Upload artifacts
@@ -446,7 +446,6 @@ jobs:
           OPENSSL_NO_VENDOR: "0"
           OPENSSL_STATIC: "1"
           SODIUM_LIB_DIR: /usr/x86_64-w64-mingw32/lib
-          SODIUM_STATIC: "1"
         run: |
           npm ci --legacy-peer-deps
           CI=true npx tauri build --target x86_64-pc-windows-gnu
@@ -630,13 +629,13 @@ jobs:
           AR_aarch64_unknown_linux_gnu: aarch64-linux-gnu-ar
           CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER: aarch64-linux-gnu-gcc
           PKG_CONFIG_SYSROOT_DIR: /usr/aarch64-linux-gnu
-          PKG_CONFIG_PATH: /usr/lib/aarch64-linux-gnu/pkgconfig
+          PKG_CONFIG_PATH: /usr/lib/aarch64-linux-gnu/pkgconfig:/usr/aarch64-linux-gnu/lib/pkgconfig
           PKG_CONFIG_ALLOW_CROSS: "1"
           OPENSSL_NO_VENDOR: "0"
           OPENSSL_STATIC: "1"
           APPIMAGE_EXTRACT_AND_RUN: "1"
+          SODIUM_LIB_DIR: /usr/lib/aarch64-linux-gnu
         run: |
-          apt-get update -qq && apt-get install -y --no-install-recommends libsodium-dev:arm64
           npm ci --legacy-peer-deps
           CI=true npx tauri build --target aarch64-unknown-linux-gnu --bundles deb,rpm
       - name: Upload artifacts

.gitea/workflows/release-beta.yml

@@ -225,7 +225,6 @@ jobs:
         env:
           APPIMAGE_EXTRACT_AND_RUN: "1"
         run: |
-          apt-get update -qq && apt-get install -y --no-install-recommends libsodium-dev
           npm ci --legacy-peer-deps
           CI=true npx tauri build --target x86_64-unknown-linux-gnu
       - name: Upload artifacts
@@ -320,6 +319,7 @@ jobs:
           OPENSSL_STATIC: "1"
           SODIUM_LIB_DIR: /usr/x86_64-w64-mingw32/lib
           SODIUM_STATIC: "1"
+          SODIUM_USE_PKG_CONFIG: "no"
         run: |
           npm ci --legacy-peer-deps
           CI=true npx tauri build --target x86_64-pc-windows-gnu
@@ -489,13 +489,12 @@ jobs:
           AR_aarch64_unknown_linux_gnu: aarch64-linux-gnu-ar
           CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER: aarch64-linux-gnu-gcc
           PKG_CONFIG_SYSROOT_DIR: /usr/aarch64-linux-gnu
-          PKG_CONFIG_PATH: /usr/lib/aarch64-linux-gnu/pkgconfig
+          PKG_CONFIG_PATH: /usr/lib/aarch64-linux-gnu/pkgconfig:/usr/aarch64-linux-gnu/lib/pkgconfig
           PKG_CONFIG_ALLOW_CROSS: "1"
           OPENSSL_NO_VENDOR: "0"
           OPENSSL_STATIC: "1"
           APPIMAGE_EXTRACT_AND_RUN: "1"
         run: |
-          apt-get update -qq && apt-get install -y --no-install-recommends libsodium-dev:arm64
           npm ci --legacy-peer-deps
           CI=true npx tauri build --target aarch64-unknown-linux-gnu --bundles deb,rpm
       - name: Upload artifacts