Replace Python CLI with Gitea issue tracker setup

Switch from a custom CLI ticketing tool to Gitea-native issue tracking.
Add issue templates (bug, feature, task) and a curated initial backlog
of 20 tickets covering project foundation, testing, security, docs,
features, and community maintenance.

.gitea/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "🐛 Bug Report"
+about: "Report something that is broken or not working as expected."
+title: "[Bug] "
+labels: ["bug", "triage"]
+assignees: []
+---
+
+## Description
+
+<!-- A clear, concise description of the bug. -->
+
+## Steps to Reproduce
+
+1.
+2.
+3.
+
+## Expected Behavior
+
+<!-- What did you expect to happen? -->
+
+## Actual Behavior
+
+<!-- What actually happened? Include logs or screenshots if helpful. -->
+
+## Environment
+
+- **OS / Distro:**
+- **Browser / Runtime version:**
+- **Commit / Release:** <!-- e.g. main @ a1b2c3d -->
+
+## Additional Context
+
+<!-- Any other details that might help diagnose the issue. -->
+

.gitea/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+
+contact_links:
+  - name: "❓ Ask a Question"
+    url: https://gitea.arcline-project.local/
+    about: "Use the discussions or chat instead."
+  - name: "📖 Project Docs"
+    url: https://docs.arcline-project.local/
+    about: "Read the documentation before filing an issue."
+

.gitea/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "✨ Feature Request"
+about: "Propose a new feature or enhancement."
+title: "[Feature] "
+labels: ["enhancement", "triage"]
+assignees: []
+---
+
+## Problem Statement
+
+<!-- What problem are you trying to solve? Why is this valuable? -->
+
+## Proposed Solution
+
+<!-- Describe the feature or enhancement you'd like to see. -->
+
+## Alternatives Considered
+
+<!-- Are there other ways to solve this? Why did you choose this approach? -->
+
+## Acceptance Criteria
+
+- [ ] <!-- Checkable criteria for when this is "done" -->
+
+## Additional Context
+
+<!-- Screenshots, references, or anything else that helps. -->
+

.gitea/ISSUE_TEMPLATE/task.md

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+---
+name: "📋 Task / Epic"
+about: "Track a general task, investigation, or epic."
+title: "[Task] "
+labels: ["task"]
+assignees: []
+---
+
+## Summary
+
+<!-- One or two sentences describing the task. -->
+
+## Subtasks
+
+- [ ]
+- [ ]
+- [ ]
+
+## Dependencies
+
+<!-- Does this block or is it blocked by other issues? -->
+
+## Notes
+
+<!-- Links, design docs, or relevant context. -->
+