Paladium Support Bot v100.3.66

Fixes:
- Uploader file captions no longer persist native RICH1 envelopes in pu_files.caption.
- Added pu_files.caption_entities_json with non-destructive migration.
- Added pu_batch_items.caption_entities_json with non-destructive migration.
- puFile() reconstructs stored caption from plain text + Telegram entities.
- Default folder caption saves now use original Telegram message text/entities directly.
- Legacy RICH1 caption migration attempts recovery and retries if an envelope remains unrecoverable.
- Hardened RICH1 decoder for escaped markers, whitespace-wrapped Base64, URL-safe Base64 and deeper JSON payloads.

Validation:
- PHP lint: 72 files, 0 errors.
- Rich round-trip test with long text + custom_emoji_id: PASS.
- ZIP integrity: PASS.
- Live Telegram/production DB test: NOT RUN in this environment.
