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/write_data.py

@@ -0,0 +1,98 @@
+'''
+Script to get air-quality values from the AMS CCS811 sensor and write to database.
+/usr/bin/python3 /var/www/nebuleair_pro_4g/CCS811/write_data.py
+
+CCS811 is a MOX gas sensor: eCO2 (equivalent CO2 in ppm, derived from VOCs) and
+TVOC (Total VOC in ppb). TVOC is the primary measurement of interest.
+
+I2C, library adafruit-circuitpython-ccs811. Address from config_table
+(key CCS811_address, e.g. "0x5A" / "0x5B"), default 0x5A.
+'''
+
+import sqlite3
+import sys
+import time
+
+DB_PATH = "/var/www/nebuleair_pro_4g/sqlite/sensors.db"
+DEFAULT_ADDRESS = 0x5A
+DATA_READY_RETRIES = 30
+DATA_READY_DELAY = 0.2  # seconds
+
+
+def get_config(cursor, key, default):
+    cursor.execute("SELECT value FROM config_table WHERE key = ?", (key,))
+    row = cursor.fetchone()
+    return row[0] if row else default
+
+
+def main():
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Self-heal: ensure the table exists even if create_db.py was skipped during OTA.
+    # Duplicates the canonical schema from sqlite/create_db.py — keep them in sync.
+    cursor.execute("""
+        CREATE TABLE IF NOT EXISTS data_CCS811 (
+            timestamp TEXT,
+            eCO2 INTEGER,
+            TVOC INTEGER
+        )
+    """)
+    conn.commit()
+
+    addr_str = get_config(cursor, "CCS811_address", "0x5A")
+    try:
+        address = int(str(addr_str), 16)
+    except ValueError:
+        address = DEFAULT_ADDRESS
+
+    try:
+        import board
+        import busio
+        import adafruit_ccs811
+    except Exception as e:
+        print(f"CCS811: library import failed: {e}")
+        conn.close()
+        sys.exit(1)
+
+    try:
+        i2c = busio.I2C(board.SCL, board.SDA)
+        ccs811 = adafruit_ccs811.CCS811(i2c, address=address)
+    except Exception as e:
+        print(f"CCS811: cannot init at {hex(address)}: {e}")
+        conn.close()
+        sys.exit(1)
+
+    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("CCS811: data not ready (warming up?), skipping.")
+            return
+
+        eco2 = int(ccs811.eco2)
+        tvoc = int(ccs811.tvoc)
+
+        cursor.execute("SELECT last_updated FROM timestamp_table LIMIT 1")
+        row = cursor.fetchone()
+        rtc_time_str = row[0]
+
+        cursor.execute(
+            "INSERT INTO data_CCS811 (timestamp, eCO2, TVOC) VALUES (?, ?, ?)",
+            (rtc_time_str, eco2, tvoc),
+        )
+        conn.commit()
+        print(f"eCO2: {eco2} ppm, TVOC: {tvoc} ppb (saved at {rtc_time_str})")
+    except Exception as e:
+        print(f"CCS811 error: {e}")
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    main()