Finish the Kick-only cutover: rewrite core/app.py, Dockerfile, requirements, README, drop sources/

Kick-only: 4 independent solutions + /formats?report=1, delete Twitch/YouTube

Lead Kick with the rung that measurably produces bytes

Gate streams on real bytes, not pipe readability

Fix Kick streams by making every rung prove it produced bytes

handle try_polaris tuple

handle try_polaris tuple

handle try_polaris tuple

fix try_polaris return + clean log

use try_polaris

use try_polaris

use try_polaris

curl_cffi first in fallback chain

add youtube source

fix typo

clean twitch source

add twitch source

add kick source

add shared extractor helpers

add sources package