fix: invalid memory access of buffer after vsnprintf

enh(cache/batchread): load columns in one trip

doc: refine Kafka source connector configuration parameters

* docs: fix broken links

* docs: fix zh/02-intro.md

Feat/force drop dnode

status resp return null when only one ep

change restore prompt message

test: increase timeouts of checking db ready

refactor: do some internal refactor.

restore learner stuck

state merge into 3.0

fix pause agg task

Test/td 21161

Update container_build.sh

fix: fill window end issue