docs: add EVM account model page (hollow and long-zero accounts)

[theekrystallee]

summary

• creates evm/development/accounts.mdx, a dedicated page explaining the Hedera account model for EVM developers covering hollow accounts (auto-created with no signing key) and long-zero accounts (existing Hedera accounts without an ECDSA key, represented as zero-padded EVM addresses)
• adds the page to the development group in docs.json navigation
• updates evm/quickstart/get-test-hbar.mdx: tightens the hollow account warning with precise terminology, adds the portal account path as an alternative to the faucet, and cross-links to the new page
• adds cross-links from evm/differences/accounts-and-keys.mdx and learn/core-concepts/accounts/auto-account-creation.mdx
• adds a hollow account entry to support/glossary.mdx

what the new page covers

resolves #655

all content fact-checked against HIP-32, HIP-542, HIP-583, and HIP-904.

hollow accounts:

• how auto account creation works and when it triggers (HBAR or tokens sent to a new EVM address)
• what hollow accounts can do (full EVM/JSON-RPC compatibility - Hardhat, Foundry, contract calls, ERC-20/ERC-721) and cannot do (no native Hedera transactions until completed)
• how completion works - automatically on first outbound EVM wallet transaction (EthereumTransaction), or explicitly via SDK
• token association behavior: ERC-20/ERC-721 require no association; HTS tokens auto-associate (maxAutoAssociations = -1 set at creation per HIP-904)
• how to look up an account ID from an EVM address (mirror node REST API + HashScan)

long-zero accounts:

• what they are and how the EVM address from account ID is derived
• why they cannot connect EVM wallets, sign EthereumTransactions, interact with smart contracts via EVM tooling, or pass ECRECOVER-based checks
• common dApp failure modes and how to detect long-zero addresses programmatically

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