feat: Add phoenixd mnemonic display (#3931)

Co-authored-by: alan <alan@lnbits.com>

lnbits/settings.py

@@ -324,7 +324,8 @@ class AssetSettings(LNbitsSettings):
             "heif",
             "heics",
             "text/plain",
-            "text/json" "text/xml",
+            "text/json",
+            "text/xml",
             "application/json",
             "application/pdf",
         ]
@@ -588,6 +589,8 @@ class ZBDFundingSource(LNbitsSettings):
 class PhoenixdFundingSource(LNbitsSettings):
     phoenixd_api_endpoint: str | None = Field(default="http://localhost:9740/")
     phoenixd_api_password: str | None = Field(default=None)
+    phoenixd_data_dir: str | None = Field(default=None)
+    phoenixd_mnemonic: str | None = Field(default=None)
 
 
 class AlbyFundingSource(LNbitsSettings):