fix(nexus_api): correct DPP calculation formula and mock data values

- DPP was calculating damage per PED instead of per PEC (100x error)
- Fixed Sollomate Opalo DPP: 3.70 → 3.33
- Added pytest.ini with asyncio configuration
- Tests now pass correctly

core/nexus_api.py

@@ -190,7 +190,7 @@ MOCK_WEAPONS = {
         damage=Decimal("4.0"),
         decay_pec=Decimal("0.13"),
         ammo_pec=Decimal("1.07"),
-        dpp=Decimal("3.70"),
+        dpp=Decimal("3.33"),
         range=26,
         attacks_per_min=56,
         item_id="sollomate_opalo"
@@ -812,12 +812,12 @@ def calculate_dpp(damage: Decimal, decay_pec: Decimal, ammo_pec: Decimal) -> Dec
         ammo_pec: Ammo cost per shot in PEC
         
     Returns:
-        DPP value
+        DPP value (damage per PEC spent)
     """
-    total_cost_ped = (decay_pec + ammo_pec) / 100
-    if total_cost_ped == 0:
+    total_cost_pec = decay_pec + ammo_pec
+    if total_cost_pec == 0:
         return Decimal("0")
-    return damage / total_cost_ped
+    return damage / total_cost_pec
 
 
 # =============================================================================

pytest.ini

@@ -0,0 +1,8 @@
+[tool:pytest]
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+asyncio_mode = auto
+asyncio_default_fixture_loop_scope = function
+addopts = -v --tb=short