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>

beancount_format.py

@@ -1,8 +1,8 @@
 """
-Format Castle entries as Beancount transactions for Fava API.
+Format Libra entries as Beancount transactions for Fava API.
 
 All entries submitted to Fava must follow Beancount syntax.
-This module converts Castle data models to Fava API format.
+This module converts Libra data models to Fava API format.
 
 Key concepts:
 - Amounts are strings: "200000 SATS" or "100.00 EUR"
@@ -35,8 +35,8 @@ def sanitize_link(text: str) -> str:
         'Test-pending'
         >>> sanitize_link("Invoice #123")
         'Invoice-123'
-        >>> sanitize_link("castle-abc123")
-        'castle-abc123'
+        >>> sanitize_link("libra-abc123")
+        'libra-abc123'
     """
     # Replace any character that's not alphanumeric, dash, underscore, slash, or period with a hyphen
     sanitized = re.sub(r'[^A-Za-z0-9\-_/.]', '-', text)
@@ -67,7 +67,7 @@ def format_transaction(
         postings: List of posting dicts (formatted by format_posting)
         payee: Optional payee
         tags: Optional tags (e.g., ["expense-entry", "approved"])
-        links: Optional links (e.g., ["castle-abc123", "^invoice-xyz"])
+        links: Optional links (e.g., ["libra-abc123", "^invoice-xyz"])
         meta: Optional transaction metadata
 
     Returns:
@@ -93,8 +93,8 @@ def format_transaction(
                 )
             ],
             tags=["expense-entry"],
-            links=["castle-abc123"],
-            meta={"user-id": "abc123", "source": "castle-expense-entry"}
+            links=["libra-abc123"],
+            meta={"user-id": "abc123", "source": "libra-expense-entry"}
         )
     """
     return {
@@ -150,7 +150,7 @@ def format_posting_with_cost(
     """
     Format a posting with cost basis for Fava API.
 
-    This is the RECOMMENDED format for all Castle transactions.
+    This is the RECOMMENDED format for all Libra transactions.
     Uses Beancount's cost basis syntax to preserve exchange rates.
 
     IMPORTANT: Beancount cost syntax uses PER-UNIT cost, not total cost.
@@ -381,7 +381,7 @@ def format_expense_entry(
     # Build entry metadata
     entry_meta = {
         "user-id": user_id,
-        "source": "castle-api",
+        "source": "libra-api",
         "entry-id": entry_id
     }
 
@@ -419,7 +419,7 @@ def format_receivable_entry(
     entry_id: Optional[str] = None
 ) -> Dict[str, Any]:
     """
-    Format a receivable entry (user owes castle).
+    Format a receivable entry (user owes libra).
 
     Uses price notation (@@ SATS) for BQL-queryable SATS tracking.
     Generates unique receivable link (^rcv-{entry_id}) for settlement tracking.
@@ -466,7 +466,7 @@ def format_receivable_entry(
 
     entry_meta = {
         "user-id": user_id,
-        "source": "castle-api",
+        "source": "libra-api",
         "entry-id": entry_id
     }
 
@@ -512,7 +512,7 @@ def format_payment_entry(
         amount_sats: Amount in satoshis (unsigned)
         description: Payment description
         entry_date: Date of payment
-        is_payable: True if castle paying user (payable), False if user paying castle (receivable)
+        is_payable: True if libra paying user (payable), False if user paying libra (receivable)
         fiat_currency: Optional fiat currency
         fiat_amount: Optional fiat amount (unsigned)
         payment_hash: Lightning payment hash
@@ -531,7 +531,7 @@ def format_payment_entry(
     # Example: 908.44 EUR / 996896 SATS = 0.000911268 EUR/SAT (matches original receivable rate)
     if fiat_currency and fiat_amount_abs and amount_sats_abs > 0:
         if is_payable:
-            # Castle paying user: DR Payable, CR Lightning
+            # Libra paying user: DR Payable, CR Lightning
             postings = [
                 format_posting_with_cost(
                     account=payable_or_receivable_account,
@@ -546,7 +546,7 @@ def format_payment_entry(
                 )
             ]
         else:
-            # User paying castle: DR Lightning, CR Receivable
+            # User paying libra: DR Lightning, CR Receivable
             postings = [
                 format_posting_simple(
                     account=payment_account,
@@ -633,7 +633,7 @@ def format_fiat_settlement_entry(
         amount_sats: Equivalent amount in satoshis
         description: Payment description
         entry_date: Date of settlement
-        is_payable: True if castle paying user (payable), False if user paying castle (receivable)
+        is_payable: True if libra paying user (payable), False if user paying libra (receivable)
         payment_method: Payment method (cash, bank_transfer, check, etc.)
         reference: Optional reference
         settled_entry_links: List of expense/receivable links being settled (e.g., ["exp-abc123", "exp-def456"])
@@ -646,7 +646,7 @@ def format_fiat_settlement_entry(
 
     # Build postings using price notation (@@ SATS) for BQL queryability
     if is_payable:
-        # Castle paying user: DR Payable, CR Cash/Bank
+        # Libra paying user: DR Payable, CR Cash/Bank
         postings = [
             {
                 "account": payable_or_receivable_account,
@@ -658,7 +658,7 @@ def format_fiat_settlement_entry(
             }
         ]
     else:
-        # User paying castle: DR Cash/Bank, CR Receivable
+        # User paying libra: DR Cash/Bank, CR Receivable
         postings = [
             {
                 "account": payment_account,
@@ -815,7 +815,7 @@ def format_revenue_entry(
     reference: Optional[str] = None
 ) -> Dict[str, Any]:
     """
-    Format a revenue entry (castle receives payment directly).
+    Format a revenue entry (libra receives payment directly).
 
     Creates a cleared transaction (flag="*") since payment was received.
 
@@ -869,7 +869,7 @@ def format_revenue_entry(
 
     # Note: created-via is redundant with #revenue-entry tag
     entry_meta = {
-        "source": "castle-api"
+        "source": "libra-api"
     }
 
     links = []