[feat][backend] Add openapi src params.

[taoyifan89]

Change-Id: I09011617cf91421324b9336eb4965b1e709a4b5c

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[codecov]

Codecov Report

❌ Patch coverage is 88.46154% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ckend/modules/observability/application/openapi.go	90.90%	1 Missing and 1 partial ⚠️
...s/observability/infra/collector/event_collector.go	0.00%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main     #441      +/-   ##
==========================================
- Coverage   73.77%   73.77%   -0.01%     
==========================================
  Files         625      625              
  Lines       64805    64818      +13     
==========================================
+ Hits        47813    47822       +9     
- Misses      13748    13750       +2     
- Partials     3244     3246       +2     

Flag	Coverage Δ
unittests	73.77% <88.46%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...end/modules/observability/infra/metrics/metrics.go	86.95% <100.00%> (+0.38%)	⬆️
...s/observability/infra/collector/event_collector.go	0.00% <0.00%> (ø)
...ckend/modules/observability/application/openapi.go	79.25% <90.90%> (+0.03%)	⬆️

... and 2 files with indirect coverage changes

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[CozeLoop]

Aime backend Go review: adding openapi src header wiring for observability tracing.

All inspected changes are low-risk from correctness, concurrency, and performance perspectives. Adding Extra.src is backward compatible and only surfaces additional metadata into the collector layer.

Inline comments will mark the touched call sites and type signatures as "No risk change" for traceability.

[CozeLoop]

Aime backend Go CR summary for PR #441

All touched observability OpenAPI entrypoints now thread an optional Extra.src field from the new thrift IDL through to the collector interface. The additional src dimension is read from an HTTP header and does not alter existing query semantics, authorization, or rate limiting logic.

I reviewed the following areas:

• Thrift IDL: new Extra struct and extra field on four OpenAPI requests use high, optional field IDs and keep Base at 255, so wire format remains backward compatible.
• Generated kitex code (types, validators, fast-path codecs): changes are mechanical and consistent with existing patterns.
• Application layer (OpenAPIApplication): new Extra.src is read safely (nil-checked) and only passed to the collector; metrics remain unchanged; no new error handling, concurrency, or performance risks identified.
• Domain & infra collector: ICollectorProvider and its implementation gained a src parameter; all call sites and mocks compile against the new signature, and the implementation remains a no-op as before.

Given the narrow scope and additive nature of these changes, I consider this PR low-risk. Inline comments are marked as "No risk change" on the modified call sites, interface signatures, and IDL definition for traceability.