chore: ratatui 0.30 maintenance + collaboration baseline (#1)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a defect or regression
+title: "[bug] "
+labels: ["bug"]
+assignees: []
+---
+
+## Summary
+Clear and concise description of the bug.
+
+## Reproduction
+1. Step one
+2. Step two
+3. Observe failure
+
+## Expected Behavior
+What should happen instead.
+
+## Environment
+- OS:
+- Rust version:
+- tui-textarea version:
+- ratatui version:
+
+## Additional Context
+Logs, screenshots, and relevant snippets.

.github/ISSUE_TEMPLATE/compatibility_request.md

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+---
+name: Compatibility request
+about: Request compatibility with ratatui/crossterm/etc.
+title: "[compat] "
+labels: ["compat-ratatui"]
+assignees: []
+---
+
+## Compatibility Target
+Library and target version (for example ratatui 0.31).
+
+## Current Behavior
+What fails today?
+
+## Expected Outcome
+What should work after this request is addressed?
+
+## Risks
+Any known API or behavior breakage concerns.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Security report
+    url: https://github.com/srothgan/tui-textarea/security/advisories/new
+    about: Please report security vulnerabilities privately.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Propose an enhancement
+title: "[feature] "
+labels: ["enhancement"]
+assignees: []
+---
+
+## Problem
+What problem are you trying to solve?
+
+## Proposed Change
+Describe the API or behavior you want.
+
+## Alternatives
+What alternatives did you consider?
+
+## Additional Context
+Any examples, references, or prior art.