fix: merge only imports release-specific packages, not common

Previous behavior: merge was adding ALL packages from isolated pool,
including common packages that were already added by update-main.

This caused duplicate processing of common packages.

New behavior: merge checks each package to see if it belongs to the
specific repo (utils or desktop) before adding it. Common packages
are skipped since they're already in the main database.

This eliminates redundant work - common packages are processed once
by update-main, and only release-specific packages are imported
from isolated databases during merge.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: igorpecovnik

tools/repository/repo.sh

@@ -806,9 +806,20 @@ merge_repos() {
 					local isolated_pool="${isolated_db}/pool"
 					if [[ -d "$isolated_pool" ]]; then
 						# Find all .deb files for this release in the isolated pool
+						# IMPORTANT: Only add packages that are actually in this repo, not all packages in pool!
 						find "$isolated_pool" -name "*.deb" -type f | while read -r deb_file; do
-							# Add to main repo
-							run_aptly -config="$main_db_config" repo add -force-replace "${release}-utils" "$deb_file"
+							# Get package info to check if it belongs to this repo
+							local deb_name deb_version deb_arch
+							deb_info=$(dpkg-deb -f "$deb_file" Package Version Architecture 2>/dev/null)
+							deb_name=$(echo "$deb_info" | sed -n '1s/Package: //p')
+							deb_version=$(echo "$deb_info" | sed -n '2s/Version: //p')
+							deb_arch=$(echo "$deb_info" | sed -n '3s/Architecture: //p')
+							local deb_key="${deb_name}_${deb_version}_${deb_arch}"
+
+							# Check if this package is in the utils repo
+							if echo "$packages" | grep -q "^${deb_key}$"; then
+								run_aptly -config="$main_db_config" repo add -force-replace "${release}-utils" "$deb_file"
+							fi
 						done
 					fi
 				fi
@@ -833,7 +844,18 @@ merge_repos() {
 					local isolated_pool="${isolated_db}/pool"
 					if [[ -d "$isolated_pool" ]]; then
 						find "$isolated_pool" -name "*.deb" -type f | while read -r deb_file; do
-							run_aptly -config="$main_db_config" repo add -force-replace "${release}-desktop" "$deb_file"
+							# Get package info to check if it belongs to this repo
+							local deb_name deb_version deb_arch
+							deb_info=$(dpkg-deb -f "$deb_file" Package Version Architecture 2>/dev/null)
+							deb_name=$(echo "$deb_info" | sed -n '1s/Package: //p')
+							deb_version=$(echo "$deb_info" | sed -n '2s/Version: //p')
+							deb_arch=$(echo "$deb_info" | sed -n '3s/Architecture: //p')
+							local deb_key="${deb_name}_${deb_version}_${deb_arch}"
+
+							# Check if this package is in the desktop repo
+							if echo "$packages" | grep -q "^${deb_key}$"; then
+								run_aptly -config="$main_db_config" repo add -force-replace "${release}-desktop" "$deb_file"
+							fi
 						done
 					fi
 				fi