feat: lettermint integration

uv.lock

@@ -215,6 +215,7 @@ dependencies = [
     { name = "itsdangerous" },
     { name = "jinja2" },
     { name = "joserfc" },
+    { name = "lettermint" },
     { name = "psycopg", extra = ["binary"] },
     { name = "pydantic" },
     { name = "pydantic-settings" },
@@ -243,6 +244,7 @@ requires-dist = [
     { name = "itsdangerous", specifier = ">=2.2.0" },
     { name = "jinja2", specifier = ">=3.1.6" },
     { name = "joserfc", specifier = ">=1.6.7" },
+    { name = "lettermint", specifier = ">=2.0.0,<3.0.0" },
     { name = "psycopg", extras = ["binary"], specifier = ">=3.3.4" },
     { name = "pydantic", specifier = ">=2.13.4" },
     { name = "pydantic-settings", specifier = ">=2.14.1" },
@@ -533,6 +535,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/c5/e4/bcf6718b5662894c6831f46296b73cd4b1a2e90c20b6d437e20c4997388c/joserfc-1.6.7-py3-none-any.whl", hash = "sha256:9e51e4a64840aa1734a058258e80a4480e2ff2d5686e480e7c92c954a92fbe05", size = 70603, upload-time = "2026-05-23T01:46:42.129Z" },
 ]
 
+[[package]]
+name = "lettermint"
+version = "2.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "httpx" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/e9/31/cf1ab1f066e48a40139bf5d90a12d657ffd90440f4f726ca4199f73f0275/lettermint-2.0.0.tar.gz", hash = "sha256:399d17c3a707a2515402245e0785534171c482cf83f9e763a6878aa4bf974e1a", size = 29415, upload-time = "2026-05-11T08:00:50.054Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/e2/b5/13978fc95fdaf977c287ef6a956795717c6d74f74504dc3958ebaf8338f1/lettermint-2.0.0-py3-none-any.whl", hash = "sha256:39859fd9a66ef2c1729889befd3c261b29641e187247c7a0334c421961c88b47", size = 21303, upload-time = "2026-05-11T08:00:48.625Z" },
+]
+
 [[package]]
 name = "mako"
 version = "1.3.12"