pyproject.toml: Simplify mypy config using strict mode

Remove 8 redundant mypy settings that are already enabled by strict
mode: warn_redundant_casts, strict_equality, disallow_any_generics,
warn_unused_ignores, disallow_untyped_calls, warn_return_any,
disallow_incomplete_defs, disallow_untyped_defs.

Keep warn_unreachable explicitly since it's not part of strict mode.
Also remove the duplicate exhaustive-match entry from enable_error_code.

Assisted-by: unsloth/Qwen3.6-35B-A3B-GGUF:IQ4_NL and pi.dev 0.81.1
Signed-off-by: Jan Lindemann <jan@janware.com>

conf/templates/pyproject.toml

@@ -2,24 +2,10 @@
 
   {mypypath}
 
-  warn_redundant_casts = true
+  strict = true
-
-  strict_equality = true
-
-  disallow_any_generics = true
-
-  warn_unused_ignores = true
 
   warn_unreachable = true
 
-  disallow_untyped_calls = true
-
-  warn_return_any = true
-
-  disallow_incomplete_defs = true
-
-  disallow_untyped_defs = true
-
   enable_error_code = [
     "explicit-override",
     "ignore-without-code",