feat(stats): add /stats usage dashboard + Z AI provider auth #286

Job	Run time
nix-test (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/pythinker)	1m 46s
check	44s
nix-test (macos-14, aarch64-apple-darwin, dist/pythinker)	2m 59s
test (3.12)	8m 0s
nix-test (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/pythinker)	1m 18s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/onefile/pythinker)	2m 37s
test (3.13)	7m 43s
test (3.14)	7m 49s
release-validate	11s
build (macos-14, aarch64-apple-darwin, dist/onefile/pythinker)	3m 10s
build (windows-2025-vs2026, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe, true)	4m 14s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/onefile/pythinker)	3m 18s
build (windows-2022, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe)	4m 14s
	48m 3s

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