refactor: Switch from CI/CD runners to Forgejo Packages distribution

- Remove .forgejo/workflows/build.yml (not needed)
- Remove FORGEJO_CI_CD_SETUP.md (runner approach obsolete)
- Remove PHASE_3_3_CI_CD_SUMMARY.md (CI/CD approach replaced)
- Add upload_to_packages.ps1 (Windows upload script)
- Add upload_to_packages.sh (macOS upload script)
- Add FORGEJO_PACKAGES_SETUP.md (comprehensive guide)
- Update DEVELOPMENT_PLAN.md Phase 3.3

Rationale:
- Simpler: No runner installation needed
- More practical: Manual builds on local machines
- More flexible: Build when you want
- Same distribution hub: Forgejo Packages
- Same auto-update integration: UpdateManager queries API

Release workflow:
1. Build locally on Windows and macOS
2. Upload both to Forgejo Packages
3. Tag release: git tag v1.0.0
4. Users download from Packages page

build/scripts/upload_to_packages.ps1

@@ -0,0 +1,80 @@
+# Upload Windows Build to Forgejo Packages
+# Usage: .\upload_to_packages.ps1 -Version 1.0.0 -ForgejoToken $token
+
+param(
+    [Parameter(Mandatory=$true)]
+    [string]$Version,
+    
+    [Parameter(Mandatory=$true)]
+    [string]$ForgejoToken,
+    
+    [string]$ForgejoUrl = "https://git.him-tools.de",
+    [string]$Repo = "HIM-public/webdrop-bridge",
+    [string]$ExePath = "build\dist\windows\WebDropBridge.exe",
+    [string]$ChecksumPath = "build\dist\windows\WebDropBridge.exe.sha256"
+)
+
+$ErrorActionPreference = "Stop"
+
+# Verify files exist
+if (-not (Test-Path $ExePath)) {
+    Write-Host "ERROR: Executable not found at $ExePath" -ForegroundColor Red
+    exit 1
+}
+
+if (-not (Test-Path $ChecksumPath)) {
+    Write-Host "ERROR: Checksum file not found at $ChecksumPath" -ForegroundColor Red
+    exit 1
+}
+
+Write-Host "Uploading WebDropBridge $Version to Forgejo Packages..." -ForegroundColor Cyan
+
+# Get file info
+$exeSize = (Get-Item $ExePath).Length / 1MB
+$checksum = Get-Content $ChecksumPath -Raw
+
+Write-Host "File: WebDropBridge.exe ($([math]::Round($exeSize, 2)) MB)"
+Write-Host "Checksum: $($checksum.Substring(0, 16))..."
+
+# Upload executable
+Write-Host "`nUploading executable..." -ForegroundColor Yellow
+$exeUrl = "$ForgejoUrl/api/v1/repos/$Repo/packages/generic/webdrop-bridge/$Version/WebDropBridge.exe"
+
+$headers = @{
+    "Authorization" = "token $ForgejoToken"
+}
+
+try {
+    $response = Invoke-WebRequest -Uri $exeUrl `
+        -Method PUT `
+        -Headers $headers `
+        -InFile $ExePath `
+        -ContentType "application/octet-stream"
+    
+    Write-Host "✓ Executable uploaded successfully" -ForegroundColor Green
+}
+catch {
+    Write-Host "ERROR uploading executable: $_" -ForegroundColor Red
+    exit 1
+}
+
+# Upload checksum
+Write-Host "Uploading checksum..." -ForegroundColor Yellow
+$checksumUrl = "$ForgejoUrl/api/v1/repos/$Repo/packages/generic/webdrop-bridge/$Version/WebDropBridge.exe.sha256"
+
+try {
+    $response = Invoke-WebRequest -Uri $checksumUrl `
+        -Method PUT `
+        -Headers $headers `
+        -Body $checksum `
+        -ContentType "text/plain"
+    
+    Write-Host "✓ Checksum uploaded successfully" -ForegroundColor Green
+}
+catch {
+    Write-Host "ERROR uploading checksum: $_" -ForegroundColor Red
+    exit 1
+}
+
+Write-Host "`n✓ Upload complete!" -ForegroundColor Green
+Write-Host "View at: $ForgejoUrl/$Repo/packages" -ForegroundColor Cyan

build/scripts/upload_to_packages.sh

@@ -0,0 +1,91 @@
+#!/bin/bash
+# Upload macOS Build to Forgejo Packages
+# Usage: ./upload_to_packages.sh -v 1.0.0 -t $token
+
+set -e
+
+# Parse arguments
+VERSION=""
+FORGEJO_TOKEN=""
+FORGEJO_URL="https://git.him-tools.de"
+REPO="HIM-public/webdrop-bridge"
+DMG_PATH="build/dist/macos/WebDropBridge.dmg"
+CHECKSUM_PATH="build/dist/macos/WebDropBridge.dmg.sha256"
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -v|--version) VERSION="$2"; shift 2;;
+        -t|--token) FORGEJO_TOKEN="$2"; shift 2;;
+        -u|--url) FORGEJO_URL="$2"; shift 2;;
+        *) echo "Unknown option: $1"; exit 1;;
+    esac
+done
+
+if [ -z "$VERSION" ] || [ -z "$FORGEJO_TOKEN" ]; then
+    echo "Usage: $0 -v VERSION -t TOKEN [-u FORGEJO_URL]"
+    echo "Example: $0 -v 1.0.0 -t your_token_here"
+    exit 1
+fi
+
+# Verify files exist
+if [ ! -f "$DMG_PATH" ]; then
+    echo "ERROR: DMG file not found at $DMG_PATH"
+    exit 1
+fi
+
+if [ ! -f "$CHECKSUM_PATH" ]; then
+    echo "ERROR: Checksum file not found at $CHECKSUM_PATH"
+    exit 1
+fi
+
+echo "Uploading WebDropBridge $VERSION to Forgejo Packages..."
+
+# Get file info
+DMG_SIZE=$(du -m "$DMG_PATH" | cut -f1)
+CHECKSUM=$(cat "$CHECKSUM_PATH")
+
+echo "File: WebDropBridge.dmg ($DMG_SIZE MB)"
+echo "Checksum: ${CHECKSUM:0:16}..."
+
+# Upload DMG
+echo ""
+echo "Uploading DMG..."
+DMG_URL="$FORGEJO_URL/api/v1/repos/$REPO/packages/generic/webdrop-bridge/$VERSION/WebDropBridge.dmg"
+
+HTTP_CODE=$(curl -s -w "%{http_code}" -X PUT \
+    -H "Authorization: token $FORGEJO_TOKEN" \
+    --data-binary "@$DMG_PATH" \
+    -H "Content-Type: application/octet-stream" \
+    "$DMG_URL" \
+    -o /tmp/curl_response.txt)
+
+if [ "$HTTP_CODE" -eq 201 ] || [ "$HTTP_CODE" -eq 200 ]; then
+    echo "✓ DMG uploaded successfully"
+else
+    echo "ERROR uploading DMG (HTTP $HTTP_CODE)"
+    cat /tmp/curl_response.txt
+    exit 1
+fi
+
+# Upload checksum
+echo "Uploading checksum..."
+CHECKSUM_URL="$FORGEJO_URL/api/v1/repos/$REPO/packages/generic/webdrop-bridge/$VERSION/WebDropBridge.dmg.sha256"
+
+HTTP_CODE=$(curl -s -w "%{http_code}" -X PUT \
+    -H "Authorization: token $FORGEJO_TOKEN" \
+    -d "$CHECKSUM" \
+    -H "Content-Type: text/plain" \
+    "$CHECKSUM_URL" \
+    -o /tmp/curl_response.txt)
+
+if [ "$HTTP_CODE" -eq 201 ] || [ "$HTTP_CODE" -eq 200 ]; then
+    echo "✓ Checksum uploaded successfully"
+else
+    echo "ERROR uploading checksum (HTTP $HTTP_CODE)"
+    cat /tmp/curl_response.txt
+    exit 1
+fi
+
+echo ""
+echo "✓ Upload complete!"
+echo "View at: $FORGEJO_URL/$REPO/packages"