feat: add GPU-specific fields to marketplace offers and create dedicated GPU marketplace router

- Add GPU fields (model, memory, count, CUDA version, price, region) to MarketplaceOffer model
- Create new marketplace_gpu router for GPU-specific operations
- Update offer sync to populate GPU fields from miner capabilities
- Move GPU attributes from generic attributes dict to dedicated fields
- Update MarketplaceOfferView schema with GPU fields
- Expand CLI README with comprehensive documentation and

docs/cli-summary.md

@@ -0,0 +1,55 @@
+# AITBC CLI Enhancement Summary
+
+## Overview
+All CLI enhancement phases (0–5) are complete. The AITBC CLI provides a production-ready interface with 116/116 tests passing, 11 command groups, and 80+ subcommands.
+
+## Architecture
+- **Package**: `cli/aitbc_cli/` with modular commands
+- **Framework**: Click + Rich for output formatting
+- **Testing**: pytest with Click CliRunner, 116/116 passing
+- **CI/CD**: `.github/workflows/cli-tests.yml` (Python 3.10/3.11/3.12)
+
+## Command Groups
+
+| Group | Subcommands |
+|-------|-------------|
+| **client** | submit, status, blocks, receipts, cancel, history, batch-submit, template |
+| **miner** | register, poll, mine, heartbeat, status, earnings, update-capabilities, deregister, jobs, concurrent-mine |
+| **wallet** | balance, earn, spend, send, history, address, stats, stake, unstake, staking-info, create, list, switch, delete, backup, restore, info, request-payment, multisig-create, multisig-propose, multisig-sign |
+| **auth** | login, logout, token, status, refresh, keys (create/list/revoke), import-env |
+| **blockchain** | blocks, block, transaction, status, sync-status, peers, info, supply, validators |
+| **marketplace** | gpu (register/list/details/book/release), orders, pricing, reviews |
+| **admin** | status, jobs, miners, analytics, logs, maintenance, audit-log |
+| **config** | show, set, path, edit, reset, export, import, validate, environments, profiles, set-secret, get-secret |
+| **monitor** | dashboard, metrics, alerts, history, webhooks |
+| **simulate** | init, user (create/list/balance/fund), workflow, load-test, scenario, results, reset |
+| **plugin** | install, uninstall, list, toggle |
+
+## Global Options
+- `--output table|json|yaml` — Output format
+- `--url URL` — Override coordinator URL
+- `--api-key KEY` — Override API key
+- `-v|-vv|-vvv` — Verbosity levels
+- `--debug` — Debug mode
+- `--config-file PATH` — Custom config file
+
+## Installation
+```bash
+cd /home/oib/windsurf/aitbc
+pip install -e .
+```
+
+## Key Features
+- Rich output formatting (table/JSON/YAML)
+- Retry with exponential backoff
+- Progress bars for long-running operations
+- Interactive prompts for destructive operations
+- Multi-wallet support with staking and multi-sig
+- Encrypted configuration secrets
+- Audit logging
+- Plugin system for custom commands
+- Real-time monitoring dashboard
+- Webhook notifications
+- Batch job submission from CSV/JSON
+- Job templates for repeated tasks
+- Shell completion and man pages