feat(network-monitor): add fees support

[SantiagoPittella]

Closes #2450

Summary

On fee-charging chains the monitor now funds its accounts from the faucet (reusing the existing PoW token-request flow) and keeps itself funded:

• Wallet and counter are funded with public P2ID faucet notes, consumed as unauthenticated input notes by each account's first transaction (input-note assets land before the epilogue withdraws the fee, so empty-vault accounts bootstrap themselves).
• The counter prices the increment note at the per-transaction fee bound, so every increment attaches a FEE_SPONSORSHIP note that pays for the network transaction consuming it. It also allowlists the sponsorship and P2ID scripts and carries BasicWallet (as does the wallet, to consume P2ID notes).
• The wallet's fee balance is tracked, shown on the dashboard, and topped up automatically from the faucet when it runs low. A failed top-up flips the card unhealthy.
• The fee asset is callback-enabled, so every transaction moving it must provision the issuing faucet as a foreign account. The monitor fetches the faucet's full state and witness at the reference block.
• The remote-prover probe funds its payload the same way, but does not require re-funding since it never actually spends it. A fee-charging chain without --faucet-url fails the monitor at startup

Mainnet, which has no faucet, is a follow-up.

Also in this PR:

• Genesis now pre-funds the native faucet's own vault with 1,000 MIDEN. Mint requests execute as network transactions paying fees from the faucet's vault, which was empty, so minting deadlocked on any fee-charging chain.
• Bumped the miden protocol dependencies from 0.16.0-rc.4 to 0.16.0-rc.6 (version pins only, no code changes needed).
• Zero-fee chains keep today's exact behavior.

TEsted it against a live local stack (fee-enabled genesis, base fee 500) with the faucet from 0xMiden/faucet#289: funding, deployment, increments with sponsorships, and automatic top-up all worked end to end.

Changelog

[[entry]]
scope       = "network-monitor"
impact      = "added"
description = "Support fee-charging chains: the monitor funds its accounts from the faucet, attaches fee sponsorships to increment notes, and tops its balance up automatically."

[[entry]]
scope       = "node"
impact      = "fixed"
description = "Pre-fund the generated native faucet's own vault at genesis so its mint network transactions can pay fees."

[[entry]]
scope       = "general"
impact      = "changed"
description = "Bump miden protocol dependencies to 0.16.0-rc.6."