feat: add ty type checking support and fix type issues

- Add ty.toml configuration with Django project root
- Add py.typed marker for type checking
- Fix type issues across codebase:
  - Add type ignore comments for redis.exceptions imports
  - Fix django.db.models.functions imports in utils
  - Fix getattr usage in accounts/forms
  - Remove unnecessary type annotations in dashboard/forms
- Configure ty to exclude migrations and respect ignore files
- All ty checks now pass (29 diagnostics -> 0)

requirements.txt

@@ -547,6 +547,25 @@ tinycss2==1.4.0 \
     # via
     #   bleach
     #   livegraphsdjango
+ty==0.0.1a25 \
+    --hash=sha256:0a90d897a7c1a5ae9b41a4c7b0a42262a06361476ad88d783dbedd7913edadbc \
+    --hash=sha256:168fc8aee396d617451acc44cd28baffa47359777342836060c27aa6f37e2445 \
+    --hash=sha256:1711dd587eccf04fd50c494dc39babe38f4cb345bc3901bf1d8149cac570e979 \
+    --hash=sha256:192edac94675a468bac7f6e04687a77a64698e4e1fe01f6a048bf9b6dde5b703 \
+    --hash=sha256:4a247061bd32bae3865a236d7f8b6c9916c80995db30ae1600999010f90623a9 \
+    --hash=sha256:5550b24b9dd0e0f8b4b2c1f0fcc608a55d0421dd67b6c364bc7bf25762334511 \
+    --hash=sha256:5f4c9b0cf7995e2e3de9bab4d066063dea92019f2f62673b7574e3612643dd35 \
+    --hash=sha256:93c7e7ab2859af0f866d34d27f4ae70dd4fb95b847387f082de1197f9f34e068 \
+    --hash=sha256:949523621f336e01bc7d687b7bd08fe838edadbdb6563c2c057ed1d264e820cf \
+    --hash=sha256:94f78f621458c05e59e890061021198197f29a7b51a33eda82bbb036e7ed73d7 \
+    --hash=sha256:a2fad3d8e92bb4d57a8872a6f56b1aef54539d36f23ebb01abe88ac4338efafb \
+    --hash=sha256:a9f3bbf523b49935bbd76e230408d858dce0d614f44f5807bbbd0954f64e0f01 \
+    --hash=sha256:d35b2c1f94a014a22875d2745aa0432761d2a9a8eb7212630d5caf547daeef6d \
+    --hash=sha256:d9656fca8062a2c6709c30d76d662c96d2e7dbfee8f70e55ec6b6afd67b5d447 \
+    --hash=sha256:dde2962d448ed87c48736e9a4bb13715a4cced705525e732b1c0dac1d4c66e3d \
+    --hash=sha256:eab6e33ebe202a71a50c3d5a5580e3bc1a85cda3ffcdc48cec3f1c693b7a873b \
+    --hash=sha256:f13ea9815f4a54a0a303ca7bf411b0650e3c2a24fc6c7889ffba2c94f5e97a6a \
+    --hash=sha256:f6b9a31da43424cdab483703a54a561b93aabba84630788505329fc5294a9c62
 types-pyyaml==6.0.12.20250915 \
     --hash=sha256:0f8b54a528c303f0e6f7165687dd33fafa81c807fcac23f632b63aa624ced1d3 \
     --hash=sha256:e7d4d9e064e89a3b3cae120b4990cd370874d2bf12fa5f46c97018dd5d3c9ab6