fix: upgrade crawl4ai to 0.8.0 (CVE-2026-26217) (#15415)

## Summary
Upgrade crawl4ai from 0.7.6 to 0.8.0 to fix CVE-2026-26217.

## Vulnerability
| Field | Value |
|-------|-------|
| **ID** | CVE-2026-26217 |
| **Severity** | CRITICAL |
| **Scanner** | trivy |
| **Rule** | `CVE-2026-26217` |
| **File** | `uv.lock` |
| **Assessment** | Likely exploitable |

**Description**: Crawl4AI Has Local File Inclusion in Docker API via
file:// URLs

## Evidence

**Scanner confirmation**: trivy rule `CVE-2026-26217` flagged this
pattern.

**Production code**: This file is in the production codebase, not
test-only code.

## Threat Model Context

This is a web service - vulnerabilities in request handlers are directly
exploitable by remote attackers.

## Changes
- `pyproject.toml`
- `uv.lock`

## Verification
- [x] Build passes
- [x] Scanner re-scan confirms fix
- [x] LLM code review passed

---
*This change addresses a pattern flagged by static analysis. The code
path handles user-influenced input and the fix reduces the attack
surface against both manual and automated exploitation.*

---
*Automated security fix by [OrbisAI Security](https://orbisappsec.com)*