fix(tray): unify wearable client on repo-root .env + fix pendant Opus load

[AnkushMalaker]

What

Fixes the unified tray's --pendant install, which produced a login item that streamed to localhost and crash-looped on launch.

clients.py — pendant Opus native lib

The pendant (BLE) path decodes Opus via opuslib, which loads native libopus through ctypes.util.find_library("opus"). That search skips Homebrew's lib dir, and launchd hands the agent a bare environment — so the tray crashed with "Could not find Opus library". Now the generated macOS plist gets DYLD_FALLBACK_LIBRARY_PATH=/opt/homebrew/lib:/usr/local/lib when the pendant extra is enabled (harmless when the dirs are absent).

local-wearable-client/{backend_sender,main}.py — unified config

The wearable client didn't read the repository-root .env the way the tray and vault sync do:

• backend_sender._resolve_backend_url() called resolve_backend_url(None), so an explicit BACKEND_URL was ignored and it fell back to localhost. It also only read BACKEND_HOST and ADMIN_* auth keys.
• Now both modules load_dotenv(REPO_ROOT / ".env") and read the unified BACKEND_URL / AUTH_USERNAME / AUTH_PASSWORD keys (mirroring vault_core), with legacy BACKEND_HOST / ADMIN_* names kept as fallbacks.

Verification

On this Mac, chronicle-tray install --pendant now installs a login item that stays up:

• vault_core: Backend URL set explicitly: http://<server>:8000
• backend_sender: Wearable backend resolved: http://<server>:8000 (ws: ws://<server>:8000/ws?codec=opus) (was localhost)
• ble_manager: Scan found N device(s) — pendant section loads, no Opus crash.

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