docs: add CHANGELOG, correct quota (1000/day), fix repo URLs in README

- User-focused READMEs with comprehensive documentation
- Comprehensive technical CHANGELOG following Keep a Changelog format
- Correct quota documentation (1,000 req/day, not 2,000)
- Fix repository references to point to original repo (gustavodiasdev)
- Update badges and clone URLs following fork best practices
- Documentation in both English (README.md) and Portuguese (README.pt-BR.md)

Author: luanweslley77

CHANGELOG.md

@@ -7,15 +7,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-### 🔧 Fixes
-
-- **Dynamic User-Agent detection** - User-Agent header now dynamically detects platform and architecture instead of hardcoded Linux/x64
-  - Supports Linux, macOS, Windows, FreeBSD, OpenBSD, Solaris, AIX
-  - Supports x64, arm64, ia32, ppc64, arm, mips architectures
-  - Maintains qwen-code v0.12.0 client version for compatibility
-  - Fixes authentication on non-Linux systems and ARM devices (M1/M2/M3 Macs, Raspberry Pi, etc.)
-
-
 ## [1.5.0] - 2026-03-14 (Updated)
 
 ### 🚨 Critical Fixes