feat(cli): add public API parity commands and release 0.16.0

[christiancuri]

Summary

• add CLI command families for Tempo, Agenda, Inbox, Automations, Exports, and booking host management
• add booking lifecycle and booking type management commands
• add row query, aggregation, bulk, views, and opt-in pagination
• support structured request bodies through inline JSON, files, stdin, fields, and query parameters
• add document generation, inbox attachment uploads, and board blueprint creation
• bump the CLI version to 0.16.0 and update the README

Verification

• go test ./...
• go vet ./...
• make build
• compiled binary reports version 0.16.0
• git diff --check

Production smoke test

Validated the compiled binary against https://api.copera.ai with a PAT containing all scopes.

Successful reads included:

• Boards, Channels, Docs, Drive, and Notifications
• Tempo calendars and activity blocks
• Agenda events
• Automation details and runs
• Booking host data and booking details
• Inbox metadata, folders, and thread listings
• Meeting note summaries and transcripts

Also validated an authorized Inbox send and a single authorized email deletion.

Known backend findings outside this PR:

• the general Inbox listing returns 500 because the Community inbox fails serialization
• fetching an individual Inbox thread returns 500, while thread listing works

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