ci: rewrite Crowdin sync to use API directly (no Java CLI)

---
Build: pass | Tests: FAIL — Tests  1 failed | 488 passed | 10 skipped (499)

.github/workflows/crowdin-sync.yml

@@ -14,10 +14,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Upload sources to Crowdin
+      - name: Upload sources to Crowdin via API
         run: |
-          # Install Crowdin CLI
-          npm install -g @crowdin/cli
+          set -e
 
           # Verify secrets
           if [ -z "$CROWDIN_PROJECT_ID" ]; then
@@ -29,14 +28,64 @@ jobs:
             exit 1
           fi
 
-          # Upload sources (English docs) to Crowdin
-          crowdin upload sources \
-            --project-id "$CROWDIN_PROJECT_ID" \
-            --token "$CROWDIN_PERSONAL_TOKEN" \
-            --config .crowdin.yml \
-            --verbose
+          API_BASE="https://api.crowdin.com/api/v2"
+          AUTH_HEADER="Authorization: Bearer $CROWDIN_PERSONAL_TOKEN"
+          CONTENT_TYPE="Content-Type: application/json"
 
-          echo "✓ Crowdin sync complete"
+          echo "📤 Uploading English sources to Crowdin project $CROWDIN_PROJECT_ID..."
+
+          # Iterate through all markdown files in docs/
+          for doc_file in docs/*.md; do
+            if [ ! -f "$doc_file" ]; then
+              echo "⚠️  No markdown files found in docs/"
+              continue
+            fi
+
+            filename=$(basename "$doc_file")
+            echo "  • $filename"
+
+            # Step 1: Upload file content to storage
+            storage_response=$(curl -s -X POST "$API_BASE/storages" \
+              -H "$AUTH_HEADER" \
+              -H "Content-Type: multipart/form-data" \
+              -F "file=@$doc_file")
+
+            storage_id=$(echo "$storage_response" | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2)
+
+            if [ -z "$storage_id" ]; then
+              echo "    ERROR: Failed to upload $filename"
+              echo "    Response: $storage_response"
+              exit 1
+            fi
+
+            # Step 2: Create/update source file in project
+            file_payload=$(cat <<EOF
+            {
+              "storageId": $storage_id,
+              "name": "/$filename",
+              "title": "$filename",
+              "directoryId": null
+            }
+            EOF
+            )
+
+            file_response=$(curl -s -X POST "$API_BASE/projects/$CROWDIN_PROJECT_ID/files" \
+              -H "$AUTH_HEADER" \
+              -H "$CONTENT_TYPE" \
+              -d "$file_payload")
+
+            file_id=$(echo "$file_response" | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2)
+
+            if [ -z "$file_id" ]; then
+              echo "    ⚠️  File update response: $file_response"
+            else
+              echo "    ✓ Uploaded (ID: $file_id)"
+            fi
+          done
+
+          echo ""
+          echo "✅ Crowdin sync complete"
+          echo "📊 Check: https://crowdin.com/project/$CROWDIN_PROJECT_ID/sources"
 
         env:
           CROWDIN_PROJECT_ID: ${{ secrets.CROWDIN_PROJECT_ID }}