feat: add branded AiGate dashboard

[machado144]

Summary

• add a local AiGate web dashboard served from the Go binary
• wire audit logging into sandbox runs and deny_exec preflight blocks
• rebrand the dashboard around AxeForge's dark/orange operator style with live counters, filters, and event timeline
• include demo recording assets and update structure lint rules for embedded web assets
• bump Go declaration to 1.25.10 so govulncheck uses the fixed standard library version

Verification

• go test ./...
• /home/youngestaxe/go/bin/go1.25.10 test ./...
• govulncheck ./...
• structlint validate --config .structlint.yaml
• served dashboard with yoink: yoink run --alias aigate-dashboard go run . serve --addr 127.0.0.1:8080
• exercised forwarded Claude command through AiGate via yoink; /api/overview recorded the run_started events

[github-actions]

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