Network-first pools management and default networks feature

[fengtality]

Summary

• Refactored pools management to use network-first approach (like tokens menu)
• Added default networks feature: users can toggle networks as defaults in the Networks menu
• Tokens and Pools menus now show only default networks with an "All Networks" button to see all
• Added checkmark indicator for default networks in the Networks menu
• Removed unnecessary "Restart Gateway" messages from pools (adding/removing pools doesn't require restart)

Changes

• handlers/config/gateway/pools.py - Complete refactor to network-first approach with pagination
• handlers/config/gateway/tokens.py - Added default networks filtering with "All Networks" option
• handlers/config/gateway/networks.py - Added default network toggle and checkmark display
• handlers/config/gateway/_shared.py - Added get_default_networks() helper function
• mcp_servers/hummingbot_api/tools/gateway.py - Updated pool handlers to use network-based API

Test plan

• Verify Networks menu shows checkmarks on default networks
• Verify toggling default status works correctly
• Verify Tokens menu shows only default networks initially
• Verify "All Networks" button shows all networks in Tokens menu
• Verify Pools menu shows only default networks initially
• Verify "All Networks" button shows all networks in Pools menu
• Verify pool pagination works correctly
• Verify adding/removing pools works without restart messages

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