[GUI][DB] Allow Custom Explorers#20
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Introduce an EXPLORER_SERVERS table with add/edit/remove/get helpers and seed the default explorers: explorer.duddino.com, testnet.duddino.com and zkbitcoin.com as a mainnet fallback. Defaults are seeded by URL so an upgrade never collides with the ids of explorers a user added previously, and NULL network metadata left behind by an older schema is backfilled. Remember the selected explorer per network (keyed by URL) in the settings cache so switching networks never remaps to an unrelated server.
BlockBookClient now resolves its URL from the active explorer selection. When the primary explorer fails, the request is retried against the other explorers configured for the active network (e.g. zkbitcoin) before the error propagates. ApiClient exposes updateExplorerUrl() to switch the active explorer at runtime.
Add an Explorer dropdown to the header, filtered to the active network, and an 'Explorer Servers config...' dialog to add, edit and remove custom explorers, mirroring the RPC servers UI. The selection is remembered per network and applied to the API client, and the dropdown refreshes when the RPC network changes.
Cover the explorer fallback retry, per-network selection persistence, network filtering of the dropdown, and the database seeding and upgrade migration. Ignore __pycache__ directories anywhere in the tree.
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This pull requests adds to the GUI a dropdown menu for explorer selection and allows for custom URL's.
We have updated the two hardcoded ones with https://explorer.duddino.com and https://testnet.duddino.com starters and it should retry zkbitcoin if the main one fails.
I have set this up so that we can save these in the DB like the RPC Servers so a user can therefore not rely on single sources for their PET4L or Ledger.
Update Screenshot:
Rockdev instances are done for now.