feat(dao): wire 8 dao_* MCP tools (Phase 1)

Tools added to WalletService:

DAO management (filesystem-only, no chain calls):
- dao_register      — save a DaoConfig under \$ALDABRA_DATA/daos/<name>.json
- dao_list          — show all registered DAO names + active marker
- dao_use           — set active DAO; subsequent dao_* calls without
                      explicit `dao` arg target this one
- dao_remove        — delete config; clears active if it was the active one
- dao_show          — render full DaoConfig JSON for audit

DAO live-state reads (Koios-backed, decoded into typed Rust):
- dao_governor_state  — singleton governor UTxO + thresholds + timing
                        + nextProposalId + per-stake proposal cap
- dao_stake_list      — all stakes for the DAO (filtered to gov-token
                        policy so the shared MLabs stakes addr doesn't
                        leak other DAOs into output). Renders pkh,
                        amount, locks, delegation per stake.
- dao_my_stake        — filters dao_stake_list to just THIS wallet's
                        stake (matches wallet pkh against StakeDatum.owner).
                        Empty array if not staked yet.

Plumbing:
- WalletService::new gains data_dir param (for DaoStore root)
- WalletInner gains dao_store + dao_reader fields
- wallet_pkh() helper extracts the wallet's payment-credential hash from
  bech32 for owner-match in dao_my_stake
- get_info() instructions advertise the new dao_* surface
- aldabra-mcp/Cargo.toml: aldabra-dao path dep + hex + pallas-addresses

crates/aldabra-mcp/src/main.rs

@@ -134,6 +134,7 @@ async fn run() -> Result<()> {
         payment_key,
         stake_key,
         cfg.max_send_lovelace,
+        cfg.data_dir.clone(),
     );
     let server = service
         .serve(stdio())