feat(flutter-cursor-templates): introduce MCP integration and conventions in project brief

- Added optional MCP integration settings in project-brief.yaml, allowing for environment-based server configurations.
- Introduced conventions for strict package imports to enhance code organization and maintainability.
- Updated brief schema to validate new MCP properties and ensure correct usage.
- Implemented MCP JSON builder to generate .cursor/mcp.json based on project brief settings.
- Enhanced resolver to include MCP configuration in generated files when enabled.

This update improves integration capabilities and enforces coding standards across the project.

flutter-cursor-templates/templates/root/tool/cursor_audit.sh.tmpl

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# {{PROJECT_NAME}} — Cursor rule hygiene (generated by cursor_gen)
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+CURSOR="${ROOT}/.cursor"
+RULES="${CURSOR}/rules"
+
+echo "== cursor_audit (${ROOT}) =="
+
+if [[ ! -d "$CURSOR" ]]; then
+  echo "ERROR: missing ${CURSOR}"
+  exit 1
+fi
+
+if [[ -d "$RULES" ]]; then
+  ac="$(grep -R "alwaysApply: true" "$RULES" --include='*.mdc' 2>/dev/null | wc -l | tr -d ' ')"
+  echo "alwaysApply: true occurrences in .cursor/rules: ${ac}"
+  echo "  (expect a small number — meta/safety; prefer scoped globs for domain rules)"
+else
+  echo "WARN: no ${RULES}"
+fi
+
+if [[ -d "$RULES/features" ]]; then
+  shopt -s nullglob
+  for f in "$RULES/features"/*.mdc; do
+    base="$(basename "$f" .mdc)"
+    if [[ ! -d "${ROOT}/lib/features/${base}" ]] && [[ ! -d "${ROOT}/lib/feature_${base}" ]]; then
+      echo "WARN: rules/features/${base}.mdc has no obvious lib/features/${base} folder — update features.modules or lib layout"
+    fi
+  done
+  shopt -u nullglob
+fi
+
+echo "OK — review warnings above after brief or folder renames"