Add configuration validation on application startup

[piiq]

Additionally this PR bumps openbb-ai to the latest version to resolve citations not rendering correctly

[Copilot]

Pull Request Overview

This PR adds configuration validation on application startup to ensure all required external services are properly configured before the app begins serving requests. Additionally, it bumps the openbb-ai dependency from version 1.5.0 to 1.7.4 to resolve citation rendering issues.

Key changes:

• Added comprehensive validation module to check OpenRouter, S3/local storage, and FMP API credentials
• Integrated startup validation into the FastAPI application lifecycle
• Updated openbb-ai dependency to latest version

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pyproject.toml	Added aiohttp dependency and bumped openbb-ai from 1.5.0 to 1.7.4
allocator_bot/validation.py	New module providing validation functions for external service credentials
allocator_bot/utils.py	Added blank line for improved formatting
allocator_bot/api.py	Integrated startup validation using FastAPI lifespan context manager
.env.example	Added VALIDATION_SKIP environment variable for development bypass

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