fix: update platformio.ini — OTA partitions, NimBLE, PSRAM flags

- Switch board to m5stack-timer-cam (confirmed in pio boards)
- Pin platform to espressif32@6.6.0
- Replace huge_app.csv with custom partitions_8mb_ota.csv (8MB + OTA)
- Add -DCONFIG_BT_NIMBLE_ENABLED=1 and -DCONFIG_SPIRAM_USE_MALLOC=1
- Add h2zero/NimBLE-Arduino@^1.4.2 to lib_deps
- Raise CORE_DEBUG_LEVEL from 1 → 3

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

firmware/partitions_8mb_ota.csv

@@ -0,0 +1,6 @@
+# Name,   Type, SubType, Offset,    Size
+nvs,      data, nvs,     0x9000,    0x6000
+otadata,  data, ota,     0xf000,    0x2000
+app0,     app,  ota_0,   0x10000,   0x300000
+app1,     app,  ota_1,   0x310000,  0x300000
+spiffs,   data, spiffs,  0x610000,  0x1F0000

firmware/platformio.ini

@@ -3,19 +3,22 @@
 default_envs = timercam
 
 [env:timercam]
-platform = espressif32
-board = esp32dev
+platform = espressif32@6.6.0
+board = m5stack-timer-cam
 framework = arduino
-board_build.partitions = huge_app.csv
+board_build.partitions = partitions_8mb_ota.csv
 build_flags =
     -DBOARD_HAS_PSRAM
     -mfix-esp32-psram-cache-issue
-    -DCORE_DEBUG_LEVEL=1
+    -DCORE_DEBUG_LEVEL=3
+    -DCONFIG_BT_NIMBLE_ENABLED=1
+    -DCONFIG_SPIRAM_USE_MALLOC=1
 monitor_speed = 115200
 upload_speed = 921600
 lib_deps =
     tzapu/WiFiManager@^2.0.17
     bblanchon/ArduinoJson@^7.0.0
+    h2zero/NimBLE-Arduino@^1.4.2
 
 [env:native]
 platform = native