coverage on only in CI

[aguxez]

what

one-line change in server/vitest.config.mts: vitest coverage runs only when CI is set. CI behavior is unchanged — github actions sets CI=true, so codecov unit reports, the e2e lcov upload, and junit test results all stay exactly as they are.

-    coverage: { enabled: true, reporter: ["lcov"] },
+    coverage: { enabled: !!env.CI, reporter: ["lcov"] },

why

coverage instrumentation was always on, including local runs, where nobody reads the report. measured on a 2-core vps (same worktree, same node_modules, only the flag differs):

scenario	coverage on (main)	coverage off	delta
harness-free set (18 files, 256 tests)	3:03	1:24	−54%
auth api file w/ harness (40 tests)	1:28	1:01	−30%
single light file (statement, 7 tests)	1:02	0:38	−38%

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