Add comprehensive NFS archiving documentation for China market productionalization

[Copilot]

Documents the existing NFS archiving feature (marcone#1004) and its value proposition for Tesla Sentry cloud deployments in China, addressing data sovereignty, cost efficiency, and infrastructure compatibility requirements.

Documentation Added

• ANSWER.md - Executive summary directly answering functionality and China productionalization benefits
• doc/NFSArchivingSupport.md - Technical deep-dive covering protocol details, mount options, and deployment scenarios
• doc/NFSArchivingSupport_CN.md - Chinese translation for local market accessibility
• doc/SetupNFS.md - Step-by-step configuration guide for Synology, QNAP, TrueNAS, and generic Linux NFS servers
• doc/NFSArchivingSupport-Summary.md - Quick reference with comparison tables and use cases
• README.md - Updated with navigation links to NFS documentation

Key Value Propositions for China Market

Regulatory Compliance

• Data sovereignty: recordings stay within China
• No cross-border data transfer
• Meets local data protection requirements

Economic Model

• Zero recurring costs vs ¥50-100/month cloud subscriptions
• NFS server handles multiple vehicles (fleet scalability)
• One-time ¥2000-3000 NAS investment

Technical Advantages

• NFSv3 over TCP optimized for Chinese network conditions
• Native support for Synology (群晖) and QNAP (威联通) - dominant local NAS brands
• No Great Firewall dependencies (purely local network)
• Root squash handling for enterprise deployments

Configuration Example

# teslausb_setup_variables.conf
export ARCHIVE_SYSTEM=nfs
export ARCHIVE_SERVER=192.168.1.10
export SHARE_NAME='/volume1/TeslaCam'

Mount automatically configured with optimized options:

rw,noauto,nolock,proto=tcp,vers=3

Rsync with NFS-specific permission handling:

rsync --no-o --no-g --no-perms --remove-source-files

Deployment Scenarios Documented

• Individual owners: Home NAS backup
• Small fleets (5-20): Centralized office storage
• Enterprise (50+): Integration with existing storage arrays
• Service centers: Local diagnostics and incident investigation

Original prompt

what is the functionality of NFS Archiving Support (marcone#1004) ? What can this new code change help on productionlization of tesla sentry cloud in China?

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