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feat(sentry): add distributed tracing between Studio and ToolHive API (#1916)

* feat(sentry): enable distributed tracing to ToolHive API

Add propagateTraceparent and tracePropagationTargets to both main and
renderer Sentry.init() so sentry-trace, baggage, and W3C traceparent
headers are automatically injected into fetch requests to localhost /
127.0.0.1.

* feat(sentry): forward Sentry DSN to thv serve for end-to-end tracing

When VITE_SENTRY_THV_DSN is set, pass --sentry-dsn,
--sentry-environment, and --sentry-traces-sample-rate to the spawned
thv serve process so the Go backend reports spans to the same trace.

* fix(sentry): gate thv serve Sentry flags on telemetry opt-in and skip in E2E
Check isTelemetryEnabled from the DB before passing --sentry-* flags to
thv serve, and skip entirely when TOOLHIVE_E2E is set — matching the
guard used by the Studio Sentry init. Add unit tests for all three
branches (DSN + telemetry enabled, no DSN, telemetry disabled).

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