Add complete community documentation

- README.md: Product overview + issue tracker landing
- SECURITY.md: Responsible disclosure policy
- CODE_OF_CONDUCT.md: Community guidelines
- CONTRIBUTING.md: How to contribute
- SUPPORT.md: Comprehensive support guide
- Issue templates: Bug, feature, support, docs, security

All references updated to evercatch.dev domain.

.gitea/issue_template/security_vulnerability.md

@@ -0,0 +1,44 @@
+---
+name: 🔐 Security Vulnerability
+about: Report a security issue (PRIVATE - use email instead)
+title: 'DO NOT USE - Email security@evercatch.dev'
+labels: security
+assignees: ''
+---
+
+# ⚠️ STOP - DO NOT USE THIS TEMPLATE
+
+**Security vulnerabilities should NOT be reported publicly.**
+
+Please email us instead: **security@evercatch.dev**
+
+## Why?
+
+Public disclosure of security issues can:
+- Put user data at risk
+- Allow attackers to exploit the vulnerability
+- Violate responsible disclosure practices
+
+## What to Include in Your Email
+
+- **Description** - What is the vulnerability?
+- **Steps to Reproduce** - How can we reproduce it?
+- **Impact** - What could an attacker do?
+- **Proof of Concept** - Code or screenshots (optional)
+- **Suggested Fix** - If you have one
+- **Your Contact Info** - For follow-up
+
+## Our Commitment
+
+- ✅ Response within 24 hours
+- ✅ Updates every 48 hours
+- ✅ Credit in security advisories (if desired)
+- ✅ Potential bug bounty (for critical issues)
+
+## Security Policy
+
+Read our full security policy: [SECURITY.md](../../SECURITY.md)
+
+---
+
+**Thank you for keeping Evercatch secure!** 🔒