Deduplicate assets on upload, fix release accumulation

.gitea/workflows/release.yml

@@ -65,6 +65,13 @@ jobs:
           )
           $names = @("LotusChat-x86_64-setup.exe", "LotusChat-x86_64-setup.nsis.zip", "LotusChat-x86_64-setup.nsis.zip.sig")
           for ($i = 0; $i -lt $files.Length; $i++) {
+            # Delete existing asset with same name if present
+            $existing = (Invoke-RestMethod -Uri "$env:GITEA_URL/api/v1/repos/$env:REPO/releases/$releaseId/assets" `
+              -Headers @{ Authorization = "token $env:TOKEN" }) | Where-Object { $_.name -eq $names[$i] }
+            if ($existing) {
+              Invoke-RestMethod -Uri "$env:GITEA_URL/api/v1/repos/$env:REPO/releases/$releaseId/assets/$($existing.id)" `
+                -Method Delete -Headers @{ Authorization = "token $env:TOKEN" }
+            }
             $bytes = [System.IO.File]::ReadAllBytes($files[$i])
             Invoke-RestMethod -Uri "$env:GITEA_URL/api/v1/repos/$env:REPO/releases/$releaseId/assets?name=$($names[$i])" `
               -Method Post `
@@ -144,6 +151,14 @@ jobs:
             "LotusChat-x86_64.AppImage.tar.gz.sig|${APPIMAGE}.tar.gz.sig"; do
             name="${file%%|*}"
             path="${file##*|}"
+            # Delete existing asset with same name if present
+            existing_id=$(curl -sf "$GITEA_URL/api/v1/repos/$REPO/releases/$RELEASE_ID/assets" \
+              -H "Authorization: token $TOKEN" \
+              | python3 -c "import sys,json; assets=json.load(sys.stdin); print(next((str(a['id']) for a in assets if a['name']=='$name'), ''))" 2>/dev/null || true)
+            if [ -n "$existing_id" ]; then
+              curl -sf -X DELETE "$GITEA_URL/api/v1/repos/$REPO/releases/$RELEASE_ID/assets/$existing_id" \
+                -H "Authorization: token $TOKEN" || true
+            fi
             echo "Uploading $name"
             curl -sf -X POST \
               "$GITEA_URL/api/v1/repos/$REPO/releases/$RELEASE_ID/assets?name=$name" \