Add meta-tools, collections, and attribution features

Meta-tools:
- Add ToolStep dataclass for tools calling other tools
- Implement execute_tool_step() with recursion depth limiting
- Add check_dependencies() for validating tool dependencies
- Add 'cmdforge check' command for dependency verification

Collections:
- Add collections API endpoints and database schema
- Create collections web UI (list and detail pages)
- Add collections to navigation header and homepage
- Document collections in REGISTRY.md

Attribution:
- Add source attribution fields to tool detail page
- Document source types (original, adapted, imported)
- Add license field documentation

Documentation updates across README, DESIGN.md, REGISTRY.md,
and new META_TOOLS.md design document.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/cmdforge/web/templates/pages/tool_detail.html

@@ -65,6 +65,25 @@
                         {% endfor %}
                     </div>
                     {% endif %}
+
+                    {% if tool.source %}
+                    <div class="mt-4 p-3 bg-amber-50 border border-amber-200 rounded-lg">
+                        <div class="flex items-center">
+                            <svg class="w-5 h-5 text-amber-600 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/>
+                            </svg>
+                            <span class="text-sm text-amber-800">
+                                Based on
+                                {% if tool.source_url %}
+                                <a href="{{ tool.source_url }}" target="_blank" rel="noopener" class="font-medium underline hover:text-amber-900">{{ tool.source }}</a>
+                                {% else %}
+                                <span class="font-medium">{{ tool.source }}</span>
+                                {% endif %}
+                                pattern
+                            </span>
+                        </div>
+                    </div>
+                    {% endif %}
                 </div>
 
                 <!-- Deprecation Warning -->