feat: Add open telemetry (#2318)

* feat: add OpenTelemetry tracing infrastructure

Introduce distributed tracing capabilities using OpenTelemetry:

- Add @opentelemetry packages to shared-server for tracing
- Create tracing utility module with span helpers (withSpan, addSpanEvent, etc.)
- Add tRPC middleware for automatic span creation on API calls
- Initialize tracing in API and workers entry points
- Add demo instrumentation to bookmark creation and crawler worker
- Add configuration options (OTEL_TRACING_ENABLED, OTEL_EXPORTER_OTLP_ENDPOINT, etc.)
- Document tracing configuration in environment variables docs

When enabled, traces are collected for tRPC calls, bookmark creation flow,
and crawler operations, with support for any OTLP-compatible backend (Jaeger, Tempo, etc.)

* refactor: remove tracing from workers for now

Keep tracing infrastructure but remove worker instrumentation:
- Remove tracing initialization from workers entry point
- Remove tracing instrumentation from crawler worker
- Fix formatting in tracing files

The tracing infrastructure remains available for future use.

* add hono and next tracing

* remove extra span logging

* more fixes

* update config

* some fixes

* upgrade packages

* remove unneeded packages

---------

Co-authored-by: Claude <noreply@anthropic.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/packages/shared-server/src/index.ts b/packages/shared-server/src/index.ts
index d42118c2..8e3b2e52 100644
--- a/packages/shared-server/src/index.ts
+++ b/packages/shared-server/src/index.ts
@@ -1,3 +1,4 @@
 export { loadAllPlugins } from "./plugins";
 export { QuotaService, StorageQuotaError } from "./services/quotaService";
 export * from "./queues";
+export * from "./tracing";