Validate route filter definitions to reject spaces with clear error messages

[Copilot]

Spaces in route filter definitions like @app.route('/api/< id:int>') were either silently registered as static routes (causing runtime errors) or raised unclear RuntimeError: Undefined route group filter ':int ' messages.

Changes

• Added validation regex in poorwsgi/wsgi.py to detect spaces in filter definitions:

  • After <: < id:int>
  • Before >: <id:int >
  • After parameter name: <id :int>
  • After colon: <id: int>

• Enhanced set_route method to validate URIs before processing and raise ValueError with actionable error message including correct format examples

• Added test suite (tests/test_route_validation.py) covering valid routes, invalid routes with spaces in various positions, and error message quality

Error Message Improvement

Before:

@app.route('/api/<id:int >')
# RuntimeError: Undefined route group filter ':int '

After:

@app.route('/api/<id:int >')
# ValueError: Invalid route definition '/api/<id:int >': 
# Route filter definitions must not contain spaces. 
# Use '<name:filter>' format without any spaces. 
# Examples: '<id:int>', '<name:word>', '<value:float>'

Note: Spaces within :re: custom regex patterns remain valid, as they're part of the regex itself.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Error when there space in filter route definition</issue_title>
<issue_description>``` python
@app.route("/api/<entity_id: int>")

crash</issue_description>

<agent_instructions>There is a error when this route is used (because space). Create pull request with fix to right and clear error log for programmer.</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Error when there space in filter route definition #25

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