feat(redis): add native JSON session storage for 4.1.0

- Add opt-in SESSION_REDIS_JSON storage for asyncio Redis backends.
- Check JSON command support at startup and reject JSON mode on Trio.
- Read legacy strings and migrate sessions on their next save.
- Validate JSON objects before transactional replacement and expiry.
- Preserve tagged serialization for datetime, tuple, and other types.
- Cover command contracts, error handling, and session round-trips.
- Document server requirements, permissions, and migration limits.
- Normalize indentation and whitespace across code, tests, and examples.
- Bump the package and lockfile to 4.1.0 and update the changelog.
- Refresh the locked pycparser dependency to 3.12.

uv.lock

@@ -296,11 +296,11 @@ wheels = [
 
 [[package]]
 name = "pycparser"
-version = "3.11"
+version = "3.12"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/da/a8/c5fdbeee588bb8ada9458774f43adf1bdd30bd59157055142183e769a024/pycparser-3.11.tar.gz", hash = "sha256:d875f09c3507d00e1aba0eecc6dcadc1352f30fff09dc6bff2f1c2935e97c2bc", size = 113796, upload-time = "2026-10-09T12:56:59.539Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/cb/27/eeb9f307bf07060f3d9f9aa0fb8c15b01bdfded0a941e4b2719c7f94cacd/pycparser-3.12.tar.gz", hash = "sha256:f03387877eab82ce01bbdfd0ba7252ee55a90b1c708d5129e2ce915475cf1db6", size = 158785, upload-time = "2026-10-22T13:40:03.56Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/90/11/0e6f11117525ff0eec40ebac3d313376f102df93ca44ad9e893ee85e4f89/pycparser-3.11-py3-none-any.whl", hash = "sha256:51d5a8ba2be0bbe440b99d2112604c95bbbc3c2748a64260186c541e1729cd80", size = 51178, upload-time = "2026-10-09T12:56:58.131Z" },
+    { url = "https://files.pythonhosted.org/packages/b6/ae/315bbeee126a769cbde43cf4908acb4b40408d8bf8bbf334dd7368d8dadf/pycparser-3.12-py3-none-any.whl", hash = "sha256:a076f3f489b39b43ed13563a1dafe42447445bec2e294154ec5c57fcdda4c85e", size = 62600, upload-time = "2026-10-22T13:40:02.021Z" },
 ]
 
 [[package]]
@@ -411,7 +411,7 @@ wheels = [
 
 [[package]]
 name = "quart-session"
-version = "4.0.0"
+version = "4.1.0"
 source = { editable = "." }
 dependencies = [
     { name = "quart" },