The auto-configured DataSource targets jdbc:ch://.../cameleer3 which fails
if the database doesn't exist yet. Schema init now uses a direct JDBC
connection to the root URL, creates the database first, then applies all
schema SQL with fully qualified cameleer3.* table names.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Server now applies schema via @PostConstruct using classpath SQL files.
All statements use IF NOT EXISTS/IF NOT EXISTS so it's idempotent and
safe to run on every startup. Removes ConfigMap and init script mount
from K8s manifest since ClickHouse no longer needs to manage the schema.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
