Stellar: adapt token, votes and access control docs to latest stellar-contracts

[brozorec]

Adapts the Stellar docs to the changes on stellar-contracts main (checked at d075db5), mainly #821, #795, #879, #881, #885, #911 and #913 (plus #748 for the RWA compliance hooks and #928 for the error codes).

Stacked on #244. Retarget to main once that PR is merged.

Commits:

1. Fungible and Non-Fungible pages.
2. The other pages that were still on the old API: Votes, Access Control, RWA and Vault.
3. Align RWA, vault and SAC admin docs with latest stellar-contracts.
4. Align governance, access, utils and fee abstraction docs with latest stellar-contracts.
5. Align the error code conventions with the upstream allocation (#928).

Breaking changes covered

Both token modules

• ContractType is now selected uniformly with Compose<(...)>, e.g. Compose<(Base,)> or Compose<(AllowList, TotalSupply)>. Combinations are only reachable through it. The docs list the valid combinations, which are checked at compile time.
• Minting goes through the contract type, <Self as XToken>::ContractType::mint*, instead of Base::mint / Enumerable::... / Consecutive::.... A callout explains why calling a primitive directly is unsafe.

Fungible

• total_supply is no longer part of FungibleToken. It is now the opt-in TotalSupply contract type plus the FungibleTotalSupply trait (new section).
• Capped is now a contract type (Compose<(Capped, TotalSupply)>) with a FungibleCapped trait exposing cap(). It used to be helper functions only.
• AllowList and BlockList can now be combined. Votes also moves voting units on mint, and it can't be combined with TotalSupply / Capped.

Non-Fungible

• sequential_mint(to) → mint(to), the old mint(to, id) → mint_with_id(to, id), and batch_mint → mint_range. A table shows which contract types support each one.
• sequential_burn is removed. The Enumerable and Consecutive examples now use NonFungibleBurnable.
• Royalty setters go through Self::ContractType::set_token_royalty / remove_token_royalty, which makes them work with Consecutive. Added an example.
• NonFungibleVotes can be combined with Enumerable or Consecutive.
• Fixed the broken Consecutive source link (non-fungible → non_fungible).

Votes (governance/votes.mdx)

• The Callout uses Compose<(FungibleVotes,)> and notes that minting must go through the contract type for voting units to be tracked. The bare FungibleVotes still compiled, so this aligns the page with the documented form rather than fixing a compile error.

Access Control (access/access-control.mdx)

• The NFT Base::mint(e, &to, token_id) no longer exists with that signature. The example now uses ContractType::mint_with_id with Compose<(Base,)>.
• Both examples are now complete contracts. The usage example was missing imports and the NonFungibleToken impl, and the role-hierarchy example imported AccessControl without implementing it.

RWA (tokens/rwa/rwa.mdx)

• RWAToken now requires FungibleTotalSupply. The example uses Compose<(RWA, TotalSupply)>, implements FungibleTotalSupply, and mints through the contract type. It also mentions Compose<(RWA, Capped, TotalSupply)>.
• Compliance hooks: can_transfer / can_create are gone (#748). transferred / created / destroyed now run after the operation, reject by panicking, and receive AccountSnapshots plus a TransferKind. I updated the interface list, the hook descriptions, the ComplianceModule trait, both diagrams and the security callout.
• Pre-existing errors fixed along the way:
  • The example never implemented Pausable or the 15 RWAToken functions that have no default body. It now does, with #[only_role(operator, "manager")].
  • The RWA::* helper snippets passed an operator argument these helpers don't take.
  • The sequence diagram used a non-existent is_verified; it's now verify_identity.
• Fixed 5 source links that broke when the identity modules moved under rwa/identity_verification/. Also replaced 2 stale #L line anchors with plain file links.

Vault (tokens/vault/vault.mdx)

• FungibleVault now requires FungibleTotalSupply. The example uses Compose<(Vault, TotalSupply)> and implements FungibleTotalSupply. It also mentions Compose<(Vault, Capped, TotalSupply)>.
• The example's deposit / withdraw overrides called operator.require_auth() before Vault::deposit / Vault::withdraw, which already require it. The example now uses the default FungibleVault functions. The custom-authorization snippet drops the duplicate auth and goes through Self::ContractType::deposit, so a capped vault still checks the cap.

Error codes (index.mdx)

• #928 moved GovernorError from 5000–5023 (which collided with Fee Abstraction) to 4200–4223, and ComplianceModuleError from 401–407 (which collided with Vault) to 383–389. No page cites any of those codes, and the overview already placed Governance in 4XXX, so the code now matches the docs.
• The overview now lists the governance blocks (Timelock 40XX, Votes 41XX, Governor 42XX). It drops Upgradeable 11XX, since the Upgradeable module has no error enum (removed in #585). It also mentions the reserved 39XX block and that codes below 100 are left to contract-specific errors.
• Every error code cited across the Stellar docs (29 citations) matches main at d075db5.

Verification

• Every full contract snippet on the 8 Fungible, Non-Fungible, Votes, Access Control, RWA and Vault pages was extracted into its own crate inside the stellar-contracts workspace (on main at d075db5) and passed cargo check with no errors or warnings. The partial snippets were checked as combined contracts: the Total Supply section, the Votes callout and the vault custom-authorization override. Synthetic capped RWA and capped vault variants were checked the same way.
• Negative control: the previous fungible, Enumerable, Access Control, RWA and Vault snippets fail to compile against main.
• All 8 pages compile with the site's MDX + GFM pipeline.