apollo_node_config,apollo_node,deployment: source private_parameters from secrets schema, drop value config schema

private_parameters() now reads the committed config_secrets_schema.json (a BTreeSet of
ParamPath) instead of deriving from config_schema.json + CONFIG_POINTERS at runtime,
removing the runtime dependency on both. Delete the value config_schema.json (4147 lines)
and the CONFIG_SCHEMA_PATH const (the native loader never read it; the per-param CLI
parser that did is gone), and remove its now-broken COPY from the sequencer Dockerfile.
Repurpose update_apollo_node_config_schema to regenerate ONLY the secrets schema, and
split the up-to-date guard to assert only the secrets schema. A transient equivalence test
(private_parameters_matches_config_dump_derivation) proves the file-sourced set equals the
old dump()+CONFIG_POINTERS derivation (no drift); it is marked for removal with the later
SerializeConfig/CONFIG_POINTERS teardown.

config_secrets_schema.json regenerates byte-identical; apollo_node_config 30/30 and
apollo_deployments 9/9 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: nimrod-starkware