feat(cli): Enhanced InproxyProxyActivity notices; new parameters

[tmgrask]

• Bump psiphon-tunnel-core dependency to commit 85311186
• Replace --max-clients with separate --max-common-clients and --max-personal-clients flags to support personal proxy compartments alongside common proxying
• Add new-compartment-id command to generate, persist, and share personal compartment IDs via v1 pairing tokens
• Add --set key=value flag for passing arbitrary Psiphon config overrides
• Consume new personalRegionActivity / commonRegionActivity maps from InproxyProxyActivity notices; accumulate per-region byte totals and client counts
• Expose per-region activity as Prometheus metrics (conduit_region_bytes_uploaded, conduit_region_bytes_downloaded, conduit_region_connecting_clients, conduit_region_connected_clients) with scope and region labels
• Include region summary in [STATS] log lines
• Add unit tests for region activity accumulation, compartment ID lifecycle, config precedence, and --set override parsing