fix: replace silent error suppression with structured logging #96

[workonlly]

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📋 Summary
This PR replaces silent error suppression (the let _ = pattern) with explicit error logging across several core modules (service, registry, and various platform adapters). The goal is to improve system observability and ensure that failures in background tasks or external API calls are visible in the logs rather than failing silently.

🔗 Related Issues
Closes #96

🧠 Context
In Rust, the let _ = syntax explicitly tells the compiler to ignore a Result. While this prevents compiler warnings, it creates "blind spots" in production where critical failures—such as a Telegram message failing to send or a tool failing to register—leave no trace. By replacing these with structured logging (error! and warn!), we ensure that the system remains robust and easier to debug without changing the actual execution flow.

🛠️ Changes
Refactored service.rs: Captured and logged errors for background service instances to prevent silent execution failures.

Improved registry.rs: Added warning logs for tool registration errors to identify configuration or compatibility issues early.

Enhanced Adapter Logging: Updated telegram.rs, dingtalk.rs, and feishu.rs to log delivery failures when sending messages to external APIs.

Standardized Error Messaging: Ensured all logs include the error description for faster root-cause analysis.

🧪 How you Tested
Compilation Check: Ran cargo check to ensure no type mismatches or ownership issues were introduced by checking results.

Manual Log Verification: Temporarily injected a connection failure in the Telegram adapter and verified that the error! log appeared in the terminal with the correct context.

Registry Validation: Verified that attempting to register a duplicate or invalid tool now triggers a warn! log as expected.

Example Log Output:

Plaintext
2026-04-19 17:45:12 ERROR [telegram] Failed to send message: Network timeout
2026-04-19 17:45:15 WARN [registry] Tool 'search_engine' failed to register: duplicate identifier
⚠️ Breaking Changes
[x] No breaking changes

🧹 Checklist
Code Quality
[x] Code follows Rust idioms and project conventions

[x] cargo fmt run

[x] cargo clippy --workspace --all-features passes locally

Testing
[x] Tests added/updated

[x] cargo test --workspace --all-features passes locally

PR Hygiene
[x] PR is small and focused (one logical change)

[x] Branch is up to date with main

[x] No unrelated commits

[x] Commit messages explain why, not only what

🚀 Deployment Notes
No migrations or configuration changes required. This is a pure refactor for improved logging.