version 1.1.0 from dev-testbed

[pgigis]

Summary

What does this PR change?

This release is a clean-up and consolidation pass on top of 1.0.0. It introduces an alternative observation backend, a clearer separation of operator policy from host-specific platform settings, several new diagnostics, and restructure of the documentation.

Testing

• cmake -S . -B build && cmake --build build
• Unit tests (ctest --test-dir build) if available
• Other (describe):

Notes

• Any behavior changes / flags / config updates?

• For XDP issues, include ip -details link show dev <if> and bpftool map dumps if relevant.

• Pipeline split into modular blocks: PacketSink egress abstraction,
  shared PipelineRunner, separate ingress and egress configuration.

• Active and passive pipelines de-duplicated into one runner.

• TUN reinjection now sets rp_filter_loose automatically when enabled
  to stop reverse-path filtering from silently dropping reinjected
  packets.

• Per-worker AF_XDP log lines demoted to DEBUG; cross-queue kernel XDP
  counters printed once every 5s at INFO.

• Single-line startup summary at INFO with backend, queue range, and
  egress configuration.

• README rewritten: shorter and focused on what the tool does and how
  to run it.

• Docs hub simplified; CLI quick reference merged into the CLI guide;
  configuration examples rewritten in plain language.