I generated multiple address (1000 address for each coin: Bitcoin, Ethereum and Tron)by my seed via iancoleman.io and put it in my website that user can deposit crypto and that works fine. now i want to access my money through a wallet that support multiple address, I mean it should automatically scan first n addresses and show the balance in my wallet and i be able to spend money through wallet. So is there any wallet that have these feature?
This is completely unrealistic use case to generate so many addresses for both Bitcoin with shitcoins and to expect some random wallet will be able to import thousands of addresses.
Each wallet usually have limited number of addresses, so you would need to manually change and test that with each wallet, but if you used BIP39 format to generate seed words than it should work in theory.
If you did this offline than your wallet should be safe, but don't import this anywhere if you did this while being online with your browser.
Best way to have good open source wallet that supports all three of this coins (btc, eth, trx) is to use open source hardware wallets like Trezor with their Trezor Suite app, or maybe Keystone hardware wallet.