v1.10.0: intégration capteur CCS811 (TVOC/eCO2, I2C)

Nouveau capteur de qualité d'air CCS811 sur le bus I2C, calqué sur le
pattern S88 (local-only, pas encore dans le payload de transmission).

- CCS811/get_data.py (lecture live) + write_data.py (timer 10s, self-heal table)
- table data_CCS811 (timestamp, eCO2, TVOC) dans create_db.py
- config CCS811 (bool) + CCS811_address (0x5A/0x5B, défaut 0x5A) dans set_config.py
- service+timer systemd nebuleair-ccs811-data (10s) + ajout boucle d'activation
- admin.html: case d'activation + dropdown adresse I2C
- sensors.html: carte Get Data (TVOC + eCO2)
- database.html + launcher.php: consultation/export/stats data_CCS811
- lib adafruit-circuitpython-ccs811 dans installation_part1.sh
- CCS811/README.md: câblage, adresses, warning clock-stretching I2C sur Pi
- CLAUDE.md + changelog mis à jour

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CCS811/get_data.py

@@ -0,0 +1,87 @@
+'''
+Live read of the AMS CCS811 air-quality sensor (used by the web "Get Data" button).
+Prints a JSON object: {"eCO2": <int_ppm>, "TVOC": <int_ppb>} or {"error": "<message>"}.
+
+CCS811 is a MOX gas sensor: it outputs an equivalent CO2 (eCO2, derived from VOCs)
+and a Total VOC (TVOC). It is NOT an NDIR CO2 sensor like the S88. TVOC is the
+primary measurement of interest here.
+
+I2C, library adafruit-circuitpython-ccs811. Address read from config_table
+(key CCS811_address, e.g. "0x5A" Adafruit / "0x5B" SparkFun), default 0x5A.
+
+Usage: /usr/bin/python3 /var/www/nebuleair_pro_4g/CCS811/get_data.py [address]
+'''
+
+import json
+import sqlite3
+import sys
+import time
+
+DB_PATH = "/var/www/nebuleair_pro_4g/sqlite/sensors.db"
+DEFAULT_ADDRESS = 0x5A
+# CCS811 produces a fresh sample every 1 s in drive mode 1. Poll data_ready a few
+# times to cover the case where the driver was just (re)initialised.
+DATA_READY_RETRIES = 30
+DATA_READY_DELAY = 0.2  # seconds
+
+
+def get_address_from_config():
+    try:
+        conn = sqlite3.connect(DB_PATH)
+        cursor = conn.cursor()
+        cursor.execute("SELECT value FROM config_table WHERE key = ?", ("CCS811_address",))
+        row = cursor.fetchone()
+        conn.close()
+        if row and row[0]:
+            return int(str(row[0]), 16)
+    except Exception:
+        pass
+    return DEFAULT_ADDRESS
+
+
+def main():
+    if len(sys.argv) > 1:
+        try:
+            address = int(sys.argv[1], 16)
+        except ValueError:
+            print(json.dumps({"error": f"invalid address {sys.argv[1]}"}))
+            return
+    else:
+        address = get_address_from_config()
+
+    try:
+        import board
+        import busio
+        import adafruit_ccs811
+    except Exception as e:
+        print(json.dumps({"error": f"library import failed: {e}"}))
+        return
+
+    try:
+        i2c = busio.I2C(board.SCL, board.SDA)
+        ccs811 = adafruit_ccs811.CCS811(i2c, address=address)
+    except Exception as e:
+        print(json.dumps({"error": f"cannot init CCS811 at {hex(address)}: {e}"}))
+        return
+
+    try:
+        ready = False
+        for _ in range(DATA_READY_RETRIES):
+            if ccs811.data_ready:
+                ready = True
+                break
+            time.sleep(DATA_READY_DELAY)
+
+        if not ready:
+            print(json.dumps({"error": "CCS811 data not ready (warming up?)"}))
+            return
+
+        eco2 = ccs811.eco2
+        tvoc = ccs811.tvoc
+        print(json.dumps({"eCO2": int(eco2), "TVOC": int(tvoc)}))
+    except Exception as e:
+        print(json.dumps({"error": f"CCS811 read error: {e}"}))
+
+
+if __name__ == "__main__":
+    main()