feat(#312): Implement core OpenTelemetry infrastructure

Complete the telemetry module with all acceptance criteria:

- Add service.version resource attribute from package.json
- Add deployment.environment resource attribute from env vars
- Add trace sampling configuration with OTEL_TRACES_SAMPLER_ARG
- Implement ParentBasedSampler for consistent distributed tracing
- Add comprehensive tests for SpanContextService (15 tests)
- Add comprehensive tests for LlmTelemetryDecorator (29 tests)
- Fix type safety issues (JSON.parse typing, template literals)
- Add security linter exception for package.json read

Test coverage: 74 tests passing, 85%+ coverage on telemetry module.

Fixes #312

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/package.json

@@ -42,6 +42,7 @@
     "@opentelemetry/instrumentation-nestjs-core": "^0.44.0",
     "@opentelemetry/resources": "^1.30.1",
     "@opentelemetry/sdk-node": "^0.56.0",
+    "@opentelemetry/sdk-trace-base": "^2.5.0",
     "@opentelemetry/semantic-conventions": "^1.28.0",
     "@prisma/client": "^6.19.2",
     "@types/marked": "^6.0.0",
@@ -76,6 +77,7 @@
     "@nestjs/cli": "^11.0.6",
     "@nestjs/schematics": "^11.0.1",
     "@nestjs/testing": "^11.1.12",
+    "@opentelemetry/context-async-hooks": "^2.5.0",
     "@swc/core": "^1.10.18",
     "@types/adm-zip": "^0.5.7",
     "@types/archiver": "^7.0.0",