fix: restore self-contained /agent-server with uv-managed Python (#2765) #10972

Job	Run time
Check OpenAPI Schema	30s
build-binary-and-test (macos-latest)	3m 12s
build-binary-and-test (ubuntu-latest)	2m 36s
Build & Push (golang-arm64)	6m 55s
Build & Push (java-amd64)	6m 36s
Build & Push (python-arm64)	6m 31s
Build & Push (python-amd64)	7m 9s
Build & Push (golang-amd64)	10m 31s
Build & Push (java-arm64)	6m 21s
Merge Multi-Arch Manifests (golang)	13s
Merge Multi-Arch Manifests (python)	24s
Merge Multi-Arch Manifests (java)	19s
Consolidate Build Information	-1s
Update PR description with agent server image	0s
	51m 16s

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