Install: add missing flask dependency + fix README webhook send example

[dayi1000]

Summary

A fresh Linux install currently breaks because the package is missing a runtime dependency and the README shows stale webhook-send usage.

Why This Matters

A new contributor should be able to install beacon-skill in a clean virtualenv and complete one basic smoke test without hidden workaround steps.

Observed Failure

Fresh install sequence:

mkdir -p /tmp/beacon-bounty && cd /tmp/beacon-bounty
python3 -m venv .venv
source .venv/bin/activate
pip install --upgrade pip
pip install beacon-skill

Observed result:

• beacon --version fails with ModuleNotFoundError: No module named 'flask'
• README Quick Start also appears to describe a stale beacon webhook send example

Scope

• Ensure the published package includes the runtime dependencies needed for a basic install / smoke test.
• Fix README examples so they match the actual CLI flags currently supported.
• Verify the basic identity + webhook smoke path on a fresh Linux virtualenv.

Acceptance Criteria

• A fresh virtualenv install does not require manual pip install flask to run beacon --version.
• beacon identity new and beacon identity show work after install.
• beacon webhook serve, beacon webhook send, and beacon inbox list work with the documented commands.
• README examples match the real CLI flags and output expectations.
• The PR includes the verification commands used.

Non-Goals

• redesigning packaging from scratch
• adding new CLI features
• broad documentation cleanup unrelated to install / smoke test flow

Claim Routing

Implementation discussion belongs here. Bounty proof / payout claim belongs in Scottcjn/rustchain-bounties#1491.

[github-actions]

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[Scottcjn]

@dayi1000 — Thank you for the install test report. Good catch on the missing flask dependency and webhook setup issue. This is exactly why we run these test bounties — finding real problems in real environments. Please provide your wallet name or RTC address for the 2 RTC payout.

[Scottcjn]

This issue now has an onboarding bounty attached in Scottcjn/rustchain-bounties#1491.

If you pick this up, claim the bounty there and reference this issue in your PR.