Add full automotive RTOS project

Add kernel (Cortex-M0/M3/M4, Tricore, S32K, RISC-V ports), drivers,
middleware (CAN stack, diagnostics, safety), applications, board
support, build/test tooling, and documentation.

.gitea/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+title: '[BUG] '
+labels: bug
+assignees: ''
+---
+
+## Bug Description
+
+<!-- A clear and concise description of what the bug is -->
+
+## Environment
+
+<!-- Please complete the following information -->
+
+- **OS**: <!-- e.g., Ubuntu 20.04, macOS 12.0, Windows 10 -->
+- **Target Board**: <!-- e.g., STM32F407 Discovery, NXP S32K144 EVB -->
+- **MCU**: <!-- e.g., STM32F407VG, S32K144 -->
+- **Compiler**: <!-- e.g., arm-none-eabi-gcc 10.3.1 -->
+- **Build Type**: <!-- Debug, Release -->
+- **RTOS Version**: <!-- e.g., 1.0.0 -->
+- **Commit SHA**: <!-- e.g., abc123def456 -->
+
+## Steps to Reproduce
+
+<!-- Detailed steps to reproduce the bug -->
+
+1.
+2.
+3.
+4.
+
+## Expected Behavior
+
+<!-- What should happen -->
+
+## Actual Behavior
+
+<!-- What actually happens -->
+
+## Code Example
+
+<!-- If applicable, provide a minimal code example -->
+
+```c
+// Your code here

.gitea/ISSUE_TEMPLATE/config.yml

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+
+## .gitea/ISSUE_TEMPLATE/config.yml
+
+```yaml
+---
+blank_issues_enabled: false
+
+contact_links:
+  - name: Documentation
+    url: https://docs.automotive-rtos.com
+    about: Check the documentation first
+
+  - name: Discussion Forum
+    url: https://github.com/automotive-rtos/rtos/discussions
+    about: Ask questions in the discussion forum
+
+  - name: Security Issues
+    url: https://github.com/automotive-rtos/rtos/security
+    about: Report security vulnerabilities here

.gitea/ISSUE_TEMPLATE/custom_issue.md

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+---
+name: Custom Issue
+about: Create a custom issue
+title: ''
+labels: ''
+assignees: ''
+---
+
+## Description
+
+<!-- Describe the issue -->
+
+## Type
+
+<!-- What type of issue is this? -->
+
+- [ ] Bug
+- [ ] Feature Request
+- [ ] Documentation
+- [ ] Performance
+- [ ] Security
+- [ ] Other
+
+## Priority
+
+<!-- What is the priority? -->
+
+- [ ] Critical
+- [ ] High
+- [ ] Medium
+- [ ] Low
+
+## Details
+
+<!-- Additional details about the issue -->
+
+## Related Issues
+
+<!-- Link to related issues -->
+
+- #123
+- #456
+
+## Labels
+
+<!-- Suggested labels -->
+
+-
+-

.gitea/ISSUE_TEMPLATE/feature_request.md

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+
+## .gitea/ISSUE_TEMPLATE/feature_request.md
+
+```markdown
+---
+name: Feature Request
+about: Suggest an idea for this project
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+---
+
+## Feature Description
+
+<!-- A clear and concise description of the feature -->
+
+## Problem Statement
+
+<!-- What problem does this feature solve? -->
+
+## Proposed Solution
+
+<!-- How should this feature work? -->
+
+## Alternative Solutions
+
+<!-- Are there alternative solutions you've considered? -->
+
+## API Design
+
+<!-- If applicable, provide proposed API design -->
+
+```c
+// Proposed API
+KernelStatus_t new_feature_function(void);