feat: add GitHub issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug or unexpected behavior
+title: "[BUG]: "
+labels:
+  - bug
+
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: Describe the issue clearly.
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps To Reproduce
+      placeholder: |
+        1. Go to...
+        2. Click...
+        3. Observe...
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+    validations:
+      required: true
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots or Additional Context

.github/ISSUE_TEMPLATE/documentation_improvement.yml

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+name: Documentation Improvement
+description: Suggest improvements to documentation
+title: "[DOCS]: "
+labels:
+  - documentation
+
+body:
+  - type: textarea
+    id: current
+    attributes:
+      label: Current Documentation Issue
+      description: What is unclear, missing, or incorrect?
+    validations:
+      required: true
+
+  - type: textarea
+    id: suggestion
+    attributes:
+      label: Suggested Improvement
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context

.github/ISSUE_TEMPLATE/enhancement_request.yml

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+name: Enhancement Request
+description: Suggest a feature or improvement
+title: "[ENHANCEMENT]: "
+labels:
+  - enhancement
+
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: What problem would this enhancement solve?
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe your idea.
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context