Fix createAnonymousContext query parameter loss

[bun-unsafe]

Problem

app.createAnonymousContext(req) documents that callers can mock request values such as querystring, but Koa reads the query string from req.url. As a result, mocked query and querystring values were silently ignored.

const ctx = app.createAnonymousContext({ querystring: 'page=1&size=10' });
ctx.query;
// => {}

Fix

Normalize a supplied querystring or query object into the mocked request URL before creating the context. An explicitly supplied url remains authoritative.

Tests

Added regression coverage for:

• querystring values
• query object values
• explicit URL precedence

The focused createAnonymousContext tests pass with 3 passing cases.

[coderabbitai]

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