Improve Cable Map exports

[FloSch62]

Summary

• Add interface operational state to XLSX and PDF cable tables alongside LLDP information.
• Add UTC date and time suffixes to downloaded XLSX and PDF filenames.
• Harden large PDF exports with serialized Typst renders, a 10-minute render timeout, non-cached job endpoints, and increased runtime resources.

Why

Cable exports previously exposed LLDP status but omitted the interface operational state. For a 1,000-node namespace, PDF generation also exceeded the previous 1 GiB memory limit. The workload restarted, the in-memory job disappeared, and the UI reported that the job had expired or could not be found.

Impact

• Operational state is optional in the topology contract and is blank when EDA does not report it.
• XLSX and PDF filenames now include a UTC timestamp in YYYY-MM-DD_HH-mm-ssZ format.
• Running PDF jobs are not expired, renders are limited to 10 minutes, and completed job data keeps the existing 10-minute retention.
• PDF renders are serialized to avoid multiplying Typst memory peaks.
• Runtime requests increase to 250m CPU and 512 MiB memory; limits increase to 2 CPU and 4 GiB memory.
• A missing job now explains that a service restart may have removed it and suggests retrying.

Validation

• go test ./...
• go vet ./...
• go build ./...
• pnpm test — 16 tests passed
• pnpm lint
• pnpm build
• Typst render using the 1,000-node fixture — 1,114 pages generated successfully
• git diff --check