feat: add unpin all subcommand with safety guards

[pcfreak30]

Add unpin all subcommand with safety guards for bulk pin removal

This PR introduces the pinner unpin all subcommand, which allows users to remove all pins (optionally filtered by status) in a single operation. Given the destructive nature of this action, multiple safety guards are implemented:

• --confirm flag required: The command will not execute without explicitly passing --confirm to acknowledge the destructive operation.
• Interactive safety prompt: By default, users must type the exact number of pins being removed to confirm the action.
• --yes flag for non-interactive use: In scripts or CI environments, --yes skips the interactive prompt (but --confirm remains required).
• --dry-run support: Preview which pins would be removed without actually unpinning them.
• --status filter: Optionally target only pins with a specific status (e.g., --status failed to unpin only failed pins).
• Batch options: Supports --parallel and --continue flags for controlling concurrency and error handling.

Key changes:

• New UnpinAll method added to the PinningService interface and implemented in PinningServiceDefault (lists pins, extracts CIDs, delegates to UnpinBatch)
• New ErrUnpinAllAborted error type for when the safety prompt is cancelled
• New --yes flag constant (FlagYes)
• Updated unpin command description and registered all as a subcommand
• Comprehensive unit tests for the new command

[kody-ai]

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[github-actions]

Code Coverage Report

Total Coverage: 33.9%

Generated from commit: a276c9a
Repository: LumeWeb/pinner-cli