feat: accept --global on :report subcommands

Every `:report` subcommand now recognizes `--global` as a scope selector that limits the report to globally-configured properties, including in JSON form via `--global --format json`. Previously this combination was rejected because `--global` was treated as an info flag, conflicting with `--format`. The shared `common.ParseReportArgs` helper now returns a `ReportArgs` struct exposing the parsed scope; each Go and bash report selects a global-only flag map when scope is global, and skips per-app verification.

plugins/common/functions

@@ -958,3 +958,62 @@ fn-registry-docker-config-dir() {
     echo "$config_dir"
   fi
 }
+
+fn-report-parse-args() {
+  declare desc="strips --format and --global flags from a report invocation, populating REPORT_FORMAT, REPORT_IS_GLOBAL, REPORT_ARGS"
+  REPORT_FORMAT="stdout"
+  REPORT_IS_GLOBAL="false"
+  REPORT_ARGS=()
+  while [[ $# -gt 0 ]]; do
+    case "$1" in
+      --format)
+        REPORT_FORMAT="$2"
+        shift 2
+        ;;
+      --global)
+        REPORT_IS_GLOBAL="true"
+        shift
+        ;;
+      *)
+        REPORT_ARGS+=("$1")
+        shift
+        ;;
+    esac
+  done
+}
+
+fn-report-emit-json() {
+  declare desc="serializes a flag_map array (passed by name) as a JSON object, stripping the --<prefix>- prefix from each key"
+  declare flag_map_name="$1" prefix="$2"
+  local -n flag_map_ref="$flag_map_name"
+  local json_output="{}"
+  for flag in "${flag_map_ref[@]}"; do
+    local key value
+    key="$(echo "$flag" | cut -d':' -f1 | sed "s/^--${prefix}-//")"
+    value="$(echo "$flag" | cut -d':' -f2- | sed 's/^ //')"
+    json_output="$(echo "$json_output" | jq -c --arg key "$key" --arg value "$value" '. + {($key): $value}')"
+  done
+  echo "$json_output"
+}
+
+fn-report-filter-global() {
+  declare desc="filters a flag_map array (passed by name) in place, keeping only entries with -global- in their flag name"
+  declare flag_map_name="$1"
+  local -n flag_map_ref="$flag_map_name"
+  local filtered=()
+  for flag in "${flag_map_ref[@]}"; do
+    local key="$(echo "$flag" | cut -d':' -f1)"
+    if [[ "$key" == *"-global-"* ]]; then
+      filtered+=("$flag")
+    fi
+  done
+  flag_map_ref=("${filtered[@]}")
+}
+
+fn-report-validate-format() {
+  declare desc="rejects --format json when an info flag is also specified"
+  declare FORMAT="$1" INFO_FLAG="$2"
+  if [[ "$FORMAT" != "stdout" ]] && [[ -n "$INFO_FLAG" ]]; then
+    dokku_log_fail "--format flag cannot be specified when specifying an info flag"
+  fi
+}