fix(install-scripts): correct critical bugs in contrib scripts

- download_and_install_bitcoincore.sh:
  - Fix apt install with single-quoted string (was treating all deps as one package)
  - Add sudo to apt install commands
  - Fix tar extraction: now finds extracted dir and copies bitcoind/bitcoin-cli to /usr/local/bin
  - Fix zmqpubrawblock -> zmqpubhashblock (pusher expects hashblock topic)
  - Fix install check (0 was testing cd, not tar) with explicit extraction check
  - Handle existing user in adduser
  - Fix source lib.sh path

- download_and_install_bal.sh:
  - Use curl -sfL (fail on 404, follow redirects) for Gitea download
  - Add null/empty check after jq download URL extraction
  - Change certbot --standalone to --nginx (avoids port 80 conflict)
  - Enable nginx site symlink (was commented out)
  - Handle existing 'bal' user in adduser

- install_tor.sh:
  - Add sudo to all root-requiring commands (apt, tee, cp, sed, systemctl)
  - Backup torrc with timestamp before modifying
  - Add DisableDebuggerAttachment hardening

contrib/download_and_install_bitcoincore.sh

@@ -52,7 +52,7 @@ for cmd in $CMD_DEPENDENCIES
 do
     if [ $(which $cmd >/dev/null 2>&1; echo $?) != 0 ]; then
         echo_e "Command not found on path: $cmd, please install or add to path"
-		apt install -y "$CMD_DEPENDENCIES"
+		sudo apt install -y $CMD_DEPENDENCIES
     fi
 done
 SYSTEMD_SERVICE="bitcoind.service"
@@ -201,19 +201,24 @@ install_bitcoin_core () {
     cd $VERSION_NUM_FULL
     tar xzf *.tar.gz
 
+    # Copy binaries to /usr/local/bin
+    extract_dir=$(find . -maxdepth 1 -type d -name 'bitcoin-*' | head -n1)
+    if [ -d "$extract_dir/bin" ]; then
+        sudo install -m 755 "$extract_dir/bin/bitcoind" /usr/local/bin/
+        sudo install -m 755 "$extract_dir/bin/bitcoin-cli" /usr/local/bin/
+    else
+        echo_e "Installation aborted: binary directory not found in extracted archive"
+        exit 1
+    fi
+
     if [ $(is_bitcoin_core_running) == 0 ]; then
         echo_i "Stopping bitcoind before installing"
         stop_bitcoin_core
         sleep 5
     fi
 
-    if [ $? == 0 ]; then
-        echo_s "Bitcoin Core $VERSION_NUM successfully installed!"
-        touch .installed
-    else
-        echo_e "Installation aborted: error while installing"
-        exit 1
-    fi
+    echo_s "Bitcoin Core $VERSION_NUM successfully installed!"
+    touch .installed
 
     cd ..
     echo $VERSION_NUM > .version
@@ -232,7 +237,7 @@ install_and_start_services () {
 init_bitcoin_core_config () {
     echo_i "USERNAME: $username"
     warning_file="File already present not forcing update."
-    sudo adduser --gecos "" --disabled-password $username
+    id $username >/dev/null 2>&1 || sudo adduser --gecos "" --disabled-password $username
     sudo adduser $username debian-tor
     userhome=$(getent passwd $username | cut -d: -f6)
     usergroup=$(sudo -u $username id -gn)
@@ -256,7 +261,7 @@ server=1
 v2transport=1
 
 # Connections
-zmqpubrawblock=tcp://127.0.0.1:28332
+zmqpubhashblock=tcp://127.0.0.1:28332
 zmqpubrawtx=tcp://127.0.0.1:28333
 
 maxuploadtarget=5000