MH: account bootstrap + wire ProtonDriveClient into pdtui TUI

Closes the final integration gap so pdtui can talk to a live Proton
Drive volume after login.

Task 1 — apps/pdtui/src/account.rs (new): PdtuiAccount implements
ProtonDriveAccount. PdtuiAccount::bootstrap performs the full key-unlock
chain: GET /core/v4/users unlocks user keys directly with the mailbox
password; GET /core/v4/addresses decrypts each address-key Token with the
user key to recover the address-key passphrase, then unlocks the address
PrivateKey, cached by email. Token signature verification against the
SignedKeyList is deferred for MVP (decrypt only). Address DTOs added to
proton-drive-api.

Task 2 — app.rs: try_build_client stub replaced. After login
(check_auth_result) or on startup resume (build_client_from_keyring), the
app assembles RpgpCrypto, two MemoryCaches, PdtuiAccount::bootstrap and
ProtonDriveClient::new, wrapping the HTTP layer in SessionAwareHttpClient
so 401-refresh works.

Task 3 — remote listing: refresh_remote lists my_files_root then
iter_folder_children, populating PaneEntry.node_uid and remote_cwd_uid;
focus/refresh re-lists; F2/F3 receive real NodeUids.

dearmor_pgp added to convert the ASCII-armored address Token to binary
before decrypt_session_key (decrypt_session_key parses raw binary and
does not de-armor) — required for the live API.

Tests: account key-unlock unit tests use a PathMock HTTP client + real
RpgpCrypto with generated test keys; the live bootstrap e2e is
#[ignore]-gated.

Co-Authored-By: jjohare <github@thedreamlab.uk>

Author: jjohare

rust/Cargo.lock

@@ -39,6 +39,8 @@ tracing.workspace = true
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 tracing-appender = "0.2"
 thiserror.workspace = true
+futures.workspace = true
 proton-drive = { path = "../../crates/proton-drive" }
 proton-drive-api = { path = "../../crates/proton-drive-api" }
+proton-drive-cache = { path = "../../crates/proton-drive-cache" }
 proton-drive-crypto = { path = "../../crates/proton-drive-crypto" }