Update for SPT 4.1.1

[bblair321]

Summary

• Target SPT ~4.1.0 / NuGet 4.1.1 with net10.0
• Replace removed DatabaseService / AbstractModMetadata APIs with injected TemplateTable, LocaleTable, TradersTable and IModMetadata
• Update lifecycle to OnLoadAsync and OnLoadOrder.PostLoad
• Make TarkovDir deploy and 7-Zip packaging conditional so builds succeed without a local SPT install
• Bump mod version to 2.1.0

Test plan

• dotnet build acidphantasm-sptreffriendlyquests.sln -c Release succeeds against SPTarkov packages 4.1.1
• Load mod in SPT 4.1.1 and confirm Ref quest edits, locales, loyalty, Lega medals, and GP coin multiplier still apply

[bblair321]

Confirmed working on SPT 4.1.1 after installing the Release build into user/mods. Mod loads cleanly and Ref quest changes apply as expected.