FEATURE REQUEST:Complete incomplete implementations with proper error handling and logging

### Is your feature request related to a problem?

- [x] Yes, it is related to a problem

### Describe the feature you'd like

## 🌟 Feature Description
Complete incomplete implementations in the codebase by replacing empty `pass` statements with proper error handling, logging, and configuration options. This enhancement addresses technical debt and improves code reliability across the event bus, Discord views, and search tool modules.

## 🔍 Problem Statement
Several files contain incomplete implementations with empty `pass` statements:
- `backend/app/core/events/event_bus.py` - 3 pass statements in handler registration methods
- `backend/integrations/discord/views.py` - 3 pass statements in exception handlers
- `backend/app/agents/devrel/tools/search_tool/ddg.py` - 1 pass statement in initialization

This creates:
- Poor debugging experience (no error logs)
- Silent failures (generic exception handling)
- Limited functionality (no retry logic or caching)
- Technical debt that affects maintainability

## 🎯 Expected Outcome
Production-ready implementations with:

**Event Bus (`event_bus.py`)**
- Duplicate handler prevention with validation
- Comprehensive logging for all registrations
- Debug information showing handler counts and event types

**Discord Views (`views.py`)**
- Specific exception handling (`discord.Forbidden`, `discord.NotFound`, `discord.HTTPException`)
- Detailed error logging with user IDs and status codes
- Better debugging for DM and interaction failures

**Search Tool (`ddg.py`)**
- Configurable timeout, retry count, and caching options
- Automatic retry logic with exponential backoff
- Timeout protection using `asyncio.wait_for`
- Optional result caching to reduce API calls

## 📷 Screenshots and Design Ideas
N/A - Backend code improvements (no UI changes)

## 📋 Additional Context
- All changes are backward compatible
- No breaking changes to existing APIs
- Removes 7 empty `pass` statements total
- Adds ~75 lines of production-ready code
- Follows project's existing code style and conventions
- Enhances error visibility and system reliability

### Record

- [x] I agree to follow this project's Code of Conduct
- [x] I want to work on implementing this feature