fix(pchronicle): fix distributed S3 manifest writes

[lizhicui]

Summary

• retry conditional S3 writes once with an unquoted ETag when the provider rejects the quoted form with 412 ConditionNotMatch
• remove the single-writer object-store manifest mode and its CLI/configuration plumbing so Gateway capture remains safe for distributed replicas
• include per-source automatic Storyline projection failures in readiness errors

Validation

• targeted pChronicle tests passed before deployment (68 passed)
• deployed extended OpenAI tools workload passed with all five tool scenarios executed and no missing tools
• restart recovery passed: 6 canonical events and 6 Storyline turns remained readable with identical response hashes
• two-replica workload passed after re-establishing the test port-forward; no ConditionNotMatch, PreconditionFailed, or Storyline startup errors observed
• deployment restored to 1 replica