Initial commit: v1.9.1 production firmware

Complete reverse engineering of TJ-56-654 weather clock from AliExpress.

Security fixes:
- Eliminated WiFi password leak vulnerability
- Removed dependency on Chinese cloud services (QWeather)
- Secure WiFiManager captive portal setup
- No hardcoded credentials

Features:
- Fully async architecture (zero blocking operations)
- OTA firmware updates (web + ArduinoOTA)
- NTP time sync with timezone + DST support
- Open-Meteo weather API (free, no registration)
- 3 display modes: time, weather, sunrise/sunset
- REST API + web interface
- EEPROM config persistence

Performance:
- Loop time: <1ms (was 10ms+)
- Memory: 409KB flash (38%), 38KB RAM (46%), 62KB IRAM (94%)
- Zero blocking delays

Hardware:
- ESP-01S (ESP8266EX, 1MB flash)
- GM009605v4.3 OLED display (128x64, I2C)
- Custom I2C mapping: SDA=GPIO0, SCL=GPIO2

Documentation:
- Complete installation guide
- Hardware specifications
- API documentation
- Troubleshooting guide
- Version history v1.5 → v1.9.1

Built with Claude Code (Opus 4.5)
Author: Andrey Petrochenko
Date: 2026-01-03

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,39 @@
+---
+name: Bug report
+about: Report a problem with the firmware
+title: '[BUG] '
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Serial Monitor Output**
+If applicable, paste serial monitor output here:
+```
+[paste output here]
+```
+
+**Environment:**
+ - Firmware version: [e.g., v1.9.1]
+ - ESP8266 board package version: [e.g., 3.0.2]
+ - Arduino IDE version: [e.g., 1.8.19]
+ - Hardware: [e.g., TJ-56-654, custom ESP-01S]
+
+**Additional context**
+Add any other context about the problem here.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.