feat: add stella-callgraph-node for JavaScript/TypeScript call graph extraction

- Implemented a new tool `stella-callgraph-node` that extracts call graphs from JavaScript/TypeScript projects using Babel AST.
- Added command-line interface with options for JSON output and help.
- Included functionality to analyze project structure, detect functions, and build call graphs.
- Created a package.json file for dependency management.

feat: introduce stella-callgraph-python for Python call graph extraction

- Developed `stella-callgraph-python` to extract call graphs from Python projects using AST analysis.
- Implemented command-line interface with options for JSON output and verbose logging.
- Added framework detection to identify popular web frameworks and their entry points.
- Created an AST analyzer to traverse Python code and extract function definitions and calls.
- Included requirements.txt for project dependencies.

chore: add framework detection for Python projects

- Implemented framework detection logic to identify frameworks like Flask, FastAPI, Django, and others based on project files and import patterns.
- Enhanced the AST analyzer to recognize entry points based on decorators and function definitions.

src/__Libraries/StellaOps.Router.Gateway/ApplicationBuilderExtensions.cs

@@ -16,6 +16,10 @@ public static class ApplicationBuilderExtensions
     /// <returns>The application builder for chaining.</returns>
     public static IApplicationBuilder UseRouterGateway(this IApplicationBuilder app)
     {
+        // Request logging and error handling wrap the full router pipeline.
+        app.UseMiddleware<RequestLoggingMiddleware>();
+        app.UseMiddleware<GlobalErrorHandlerMiddleware>();
+
         // Enforce payload limits first
         app.UseMiddleware<PayloadLimitsMiddleware>();
 
@@ -60,6 +64,10 @@ public static class ApplicationBuilderExtensions
     /// <returns>The application builder for chaining.</returns>
     public static IApplicationBuilder UseRouterGatewayCore(this IApplicationBuilder app)
     {
+        // Request logging and error handling wrap the full router pipeline.
+        app.UseMiddleware<RequestLoggingMiddleware>();
+        app.UseMiddleware<GlobalErrorHandlerMiddleware>();
+
         // Resolve endpoints from routing state
         app.UseMiddleware<EndpointResolutionMiddleware>();