get default hr and power zones from config file

extract_config.example.yaml

@@ -30,3 +30,21 @@ classifier:
   enabled: false          # ML activity type classifier (requires scikit-learn extra)
 
 incremental: true         # skip files whose hash hasn't changed since last run
+
+# athlete:
+#   max_hr: 182              # used to derive default HR zone display
+#   ftp_w: 280               # functional threshold power in watts
+#   hr_zones:                # explicit bpm boundaries [[lo, hi], ...]
+#     - [0,   115]           # Z1 recovery
+#     - [115, 137]           # Z2 endurance
+#     - [137, 155]           # Z3 tempo
+#     - [155, 169]           # Z4 threshold
+#     - [169, 999]           # Z5 VO2max
+#   power_zones:             # explicit watt boundaries
+#     - [0,   168]           # Z1 active recovery  (< 55% FTP)
+#     - [168, 224]           # Z2 endurance        (55–78%)
+#     - [224, 266]           # Z3 tempo            (78–95%)
+#     - [266, 308]           # Z4 threshold        (95–109%)
+#     - [308, 364]           # Z5 VO2max           (109–130%)
+#     - [364, 420]           # Z6 anaerobic        (130–150%)
+#     - [420, 9999]          # Z7 neuromuscular    (> 150%)