fix: resolve CI mypy failures after enterprise observability merge

[CoreyLeath-code]

Summary

• keep Ruff formatting/checks clean
• configure mypy for optional integration modules that are intentionally dependency-light
• disable stale-ignore warnings for optional-import fallbacks
• add explicit casts for HTTP/JSON return values
• make webhook status comparison explicitly boolean

Root cause

The post-merge CI run passed Ruff and security checks but failed strict mypy with 13 errors across the optional FastAPI, Kafka, OpenTelemetry, storage, and enterprise integrations.

This patch addresses those exact failures without making the optional integrations mandatory runtime dependencies.

[coderabbitai]

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Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: b8ceeb3d-4417-4fb2-b02a-8f89e8586550

📥 Commits

Reviewing files that changed from the base of the PR and between 4f339d9 and 049a143.

📒 Files selected for processing (3)

• logsight/enterprise.py
• logsight/storage.py
• pyproject.toml

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