v1.7.3: Bug fix to chainable routes with parameters

Bug Fixed:

Chainable .handler() method was broken for routes with parameters.

Root Cause:

The radix tree implementation in /src/core/routing/radix-tree.ts had a critical bug in how it parsed paths:
It wasn't skipping the leading / in paths like /users/:id
The insert() method would try to parse from index 0, hitting the / immediately
The searchNode() method would also fail to properly extract segments because it started at the wrong position

Changes Made:

• Fixed radix-tree.ts - insert() method:
  Added logic to skip the leading slash before parsing segments
  Added logic to skip additional slashes during traversal
  Fixed segment extraction to stop at both / and : characters

• Fixed radix-tree.ts - searchNode() method:
  Added logic to skip slashes at each recursion level
  Fixed segment extraction to properly handle path boundaries

• Added comprehensive test coverage in tests/integration/simple.test.ts:
  Test name: "should support chainable handler syntax with route parameters"
  Tests GET, POST, PUT, DELETE with chainable handlers
  Tests single parameter routes (e.g., /products/:id)
  Tests multiple parameter routes (e.g., /categories/:category/items/:itemId)