fix(ai-proxy): correct logging schema key in ai-proxy-multi

[yixianOu]

Description

This PR unifies the schema definition in the ai-proxy-multi plugin. Previously, the ai_proxy_multi_schema used logging_schema as the key name, which was inconsistent with the ai-proxy plugin (which uses logging). This change ensures the logging configuration key is consistent across AI proxy plugins.

Checklist

• I have unified the schema key.

Related Issue

Fixes #12671

Signed-off-by: Orician 2018783812@qq.com

[Baoyuantop]

We need to add additional tests to check the schema configuration in order to avoid encountering similar issues again.

[yixianOu]

Test Summary Report
-------------------
t/plugin/mcp-bridge.t        (Wstat: 0 Tests: 10 Failed: 3)
  Failed tests:  7-9
  Parse errors: No plan found in TAP output
Files=5, Tests=182, 56 wallclock secs ( 0.04 usr  0.01 sys +  4.80 cusr  2.30 csys =  7.15 CPU)
Result: FAIL

I don't know why the mcp-bridge test failed, it should have nothing to do with my modification.

[Baoyuantop]

Test Summary Report
-------------------
t/plugin/mcp-bridge.t        (Wstat: 0 Tests: 10 Failed: 3)
  Failed tests:  7-9
  Parse errors: No plan found in TAP output
Files=5, Tests=182, 56 wallclock secs ( 0.04 usr  0.01 sys +  4.80 cusr  2.30 csys =  7.15 CPU)
Result: FAIL

I don't know why the mcp-bridge test failed, it should have nothing to do with my modification.

Ignoring this test for now, the same issue exists in other PRs.

[Baoyuantop]

We need to add additional tests to check the schema configuration in order to avoid encountering similar issues again.

Hi @yixianOu, could you add a simple test case?

[yixianOu]

We need to add additional tests to check the schema configuration in order to avoid encountering similar issues again.

Hi @yixianOu, could you add a simple test case?

ok

[yixianOu]

add additional tests to check the schema configuration

[Baoyuantop]

This is too complicated. Please use if else statements for easier code understanding.

[Baoyuantop]

We should add it to the end of the existing test.

[yixianOu]

https://github.com/apache/apisix/actions/runs/20191178102/job/58038560408?pr=12795
CI Test Failure Analysis :

• Failed test: TEST 15 "add plugin with algorithm nanoid" in t/plugin/request-id.t
• Failure cause: Duplicate IDs occurred when generating 180 nanoids concurrently, leading to test output "ids not unique" instead of the expected "true"
• Connection to my code changes:
  • ❌ My changes didn’t affect this test. I only modified:
    • apisix/plugins/ai-proxy/schema.lua (renamed field: logging_schema → logging)
    • t/plugin/ai-proxy*.t (AI-proxy test files)
    • .gitignore
  • ✅ Neither request-id.t nor apisix/plugins/request-id.lua was modified
• Possible root cause:
  • This is an intermittent test failure, usually caused by:
    • Duplicate randomness in the nanoid library under specific concurrent conditions
    • Timing issues due to CI environment resource limits
    • Behavior of LuaJIT’s random number generator at high concurrency
  • The issue isn’t caused by my changes but by pre-existing CI instability