Add Gnosis Chain support to Siren

[mjadach-iv]

Fixes Add GNO support: would be nice if Siren detected the validators network and adjust the token in the UI accodinly #465

Add Gnosis Chain support to Siren

• derive every ETH-specific value from a new NetworkProfile resolved from the beacon spec's CONFIG_NAME, instead of hardcoded constants.
• New NetworkProfile abstraction with helpers (getNetworkProfile, gweiToNative, useNetworkProfile, getCachedNetworkProfile) keeps data in one place
• Backend now returns validator balances and rewards in native units, picks the Pectra fork from the profile, and applies strict disk thresholds on Gnosis as well as mainnet.
• Frontend swaps every hardcoded ETH label to render from profile.nativeSymbol instead, switches the ETH logo a Gnosis logo, and queries GNO price instad of ETH if needed
• Wallet write flows (create / consolidate / deposit / withdraw) now hide behind a new UnsupportedNetworkNotice on Gnosis instead of silently failing on the unregistered wagmi chain.
• Earnings math updated: chart values use gweiToNative, hourly/daily/weekly/monthly estimates pull SLOTS_PER_EPOCH from the spec (was hardcoded 32 — caused 2× undercount on Gnosis), the APR baseline is rescaled to native units, and the chart no longer caps at 10 validators.

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