[log] Add debug logging to config/config_tracing.go

[github-actions]

Adds 3 meaningful debug log calls to internal/config/config_tracing.go to improve observability of the tracing configuration pipeline.

Changes

Added logTracingCfg = logger.New("config:config_tracing") and 3 log calls:

1. Default service name applied — logs when RegisterDefaults fills in the missing ServiceName field with "mcp-gateway"
2. stdin OpenTelemetry config converted — logs entry into the RegisterStdinConverter callback with a summary of which fields are present (hasEndpoint, hasServiceName, hasTraceID)
3. Default service name in converter — logs when the stdin converter also falls back to the default service name

Why

These callbacks fire during config load and are silent today. When tracing is misconfigured (wrong endpoint, missing service name, trace-ID validation failure later in the pipeline) there is no debug signal showing whether the tracing block was ever parsed from stdin at all. These three lines fill that gap.

Validation

• make agent-finished passed (format ✓, build ✓, lint ✓, all Go tests ✓)
• Only internal/config/config_tracing.go is modified — single-file PR
• No test files modified
• Logger follows pkg:filename convention: "config:config_tracing"
• Log arguments contain only boolean flags (no secrets, no side-effectful calls)

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[Copilot]

Pull request overview

This PR improves observability of the tracing configuration pipeline by adding debug logging to the tracing config registration and stdin conversion paths in the config package. It helps diagnose whether tracing config was parsed/applied (and when defaults were filled) without changing functional behavior when debug logging is disabled.

Changes:

• Added a dedicated debug logger for tracing config (config:config_tracing).
• Logged when the default tracing service name is applied during defaults registration.
• Logged when stdin OpenTelemetry config is converted, including boolean presence of key fields, and when the converter falls back to the default service name.

Show a summary per file

File	Description
internal/config/config_tracing.go	Adds a tracing-config debug logger and three debug log statements around defaulting and stdin conversion to aid troubleshooting.

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