CI: remove all dynamic expressions (vars/secrets ||) from the workflow

No workflow runs were being created for recent pushes (total_count frozen),
while the prior commit without these expressions did create runs. Gitea's
workflow parser appears to reject the `${{ vars.* }}` / `${{ secrets.* || ... }}`
expressions, so no run is triggered at all.

Make the workflow fully static: hardcode the local proxy for the ONNX Runtime
download, drop the vars.FLUTTER_ROOT reference (env FLUTTER_ROOT + common paths
still work), and remove the commented fallback block. README documents the
runner-side options.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -30,24 +30,10 @@ jobs:
     steps:
       - name: Checkout
         uses: https://gitea.com/actions/checkout@v4
-        # Fallback if gitea.com is unreachable — clone from your own Gitea
-        # instance (always reachable from the runner). Comment out the line
-        # above and uncomment this block:
-        #
-        # - name: Checkout (manual, from local Gitea)
-        #   shell: pwsh
-        #   run: |
-        #     $t = "${{ github.token }}"
-        #     $h = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes("x-access-token:$t"))
-        #     git init
-        #     git remote add origin "${{ github.server_url }}/${{ github.repository }}.git"
-        #     git -c http.extraheader="AUTHORIZATION: basic $h" fetch --depth=1 origin "${{ github.sha }}"
-        #     git checkout --force FETCH_HEAD
 
       # The runner's Actions shell often does not inherit Flutter on PATH, so
-      # locate it and add it to PATH for subsequent steps. Override by setting
-      # the repo variable FLUTTER_ROOT (Settings > Actions > Variables) to your
-      # Flutter SDK directory, or just add Flutter's bin to the system PATH.
+      # locate it and add it to PATH for subsequent steps. Set a system env var
+      # FLUTTER_ROOT to your Flutter SDK dir, or add Flutter's bin to PATH.
       - name: Locate Flutter
         shell: pwsh
         run: |
@@ -55,7 +41,6 @@ jobs:
             Write-Host "flutter already on PATH"; exit 0
           }
           $candidates = @()
-          if ("${{ vars.FLUTTER_ROOT }}") { $candidates += (Join-Path "${{ vars.FLUTTER_ROOT }}" 'bin') }
           if ($env:FLUTTER_ROOT) { $candidates += (Join-Path $env:FLUTTER_ROOT 'bin') }
           $candidates += @(
             'C:\flutter\bin','C:\src\flutter\bin','C:\tools\flutter\bin','C:\dev\flutter\bin',
@@ -102,10 +87,10 @@ jobs:
       # system-wide to skip the download entirely.
       - name: Build Windows release
         env:
-          HTTP_PROXY: ${{ secrets.HTTP_PROXY || 'http://127.0.0.1:7890' }}
-          HTTPS_PROXY: ${{ secrets.HTTPS_PROXY || 'http://127.0.0.1:7890' }}
-          http_proxy: ${{ secrets.HTTP_PROXY || 'http://127.0.0.1:7890' }}
-          https_proxy: ${{ secrets.HTTPS_PROXY || 'http://127.0.0.1:7890' }}
+          HTTP_PROXY: http://127.0.0.1:7890
+          HTTPS_PROXY: http://127.0.0.1:7890
+          http_proxy: http://127.0.0.1:7890
+          https_proxy: http://127.0.0.1:7890
         run: flutter build windows --release
 
       - name: Show build output