WIP: reorg web.xml for cleaning and documenting

[vkirkl]

So far this does three things:

• sort the ShiroFilter config, removing some dupes and roughly grouping the endpoints
• reorg the servlets moving known used ones up, ones likely needing deprecation down, others marked for investigation
• openapi 3.0 documentation of the api/v3 endpoints

[vkirkl]

@naknomum - a first swipe at this reorg with the intent of doing a little cleanup and getting all the v3 stuff sorted prior to documenting the api endpoints. A quick sanity check on my desktop didn't crash but much more needed.

[vkirkl]

Sanity check of rough openapi docs: uvx schemathesis run http://localhost:81/api/v3/docs/openapi.yaml ... doh!