chore(release): v1.15.0 prep — version bump + changelog

[VijitSingh97]

What & why

Release prep for v1.15.0: VERSION and build/dashboard/pyproject.toml bumped in lockstep (1.14.1 → 1.15.0), uv.lock regenerated, and the changelog gains the 1.15.0 section.

In this release:

• Running confirmed earnings (Show actual running earnings (yesterday / 7-day / 30-day) in Telegram and the dashboard #787, PR feat(earnings): running yesterday/7d/30d confirmed earnings on the dashboard and in Telegram (#787) #789) — yesterday / 7d / 30d confirmed totals on the dashboard card and in Telegram /earnings, from one shared roll-up.
• Dashboard Python group bump (build(deps): bump the python group across 1 directory with 6 updates #788) — aiohttp 3.14.3, grpcio 1.83.0, plus test/dev tooling.
• CI: gitleaks allowlist for the wizard test fixture (fix(ci): allowlist the wizard handoff-password test fixture in gitleaks #799, not changelog-worthy — nothing shipped changes).

Checklist

• make lint-docs-voice + make lint-md pass locally; version-lockstep assertion satisfied (VERSION == pyproject == 1.15.0)
• This PR is focused on a single logical change

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