Rename Castle Accounting extension to Libra

Full identifier rename: module path lnbits.extensions.castle →
lnbits.extensions.libra, DB ext_castle → ext_libra, URL prefix
/castle/ → /libra/, manifest id castle → libra, fava ledger slug
default castle-ledger → libra-ledger, Beancount source metadata
castle-api → libra-api and link prefixes castle-{entry,tx}- →
libra-{entry,tx}-, column castle_wallet_id → libra_wallet_id, all
Python/JS/HTML identifiers (castle_ext, CastleSettings,
castle_reference, castleWalletConfigured, etc.).

Display name "Castle Accounting" → "Libra" (the scales/balance
metaphor — fits double-entry bookkeeping).

No backward compat: production hosts will be force-updated. Old
castle-prefixed Beancount metadata in existing Fava ledgers is
historical; new entries use libra-* prefixes going forward.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

permission_management.py

@@ -361,7 +361,7 @@ async def get_permission_analytics() -> dict:
         """
         SELECT ap.*, a.name as account_name
         FROM account_permissions ap
-        JOIN castle_accounts a ON ap.account_id = a.id
+        JOIN libra_accounts a ON ap.account_id = a.id
         WHERE ap.expires_at IS NOT NULL
         AND ap.expires_at > :now
         AND ap.expires_at <= :seven_days
@@ -385,7 +385,7 @@ async def get_permission_analytics() -> dict:
     top_accounts_result = await db.fetchall(
         """
         SELECT a.name, COUNT(ap.id) as permission_count
-        FROM castle_accounts a
+        FROM libra_accounts a
         LEFT JOIN account_permissions ap ON a.id = ap.account_id
         GROUP BY a.id, a.name
         HAVING COUNT(ap.id) > 0