docs: add GitHub Issue Templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐛 Bug Report
+description: File a bug report to help us improve Aarini
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ### 🌸 Welcome to Aarini!
+        Thank you for helping us make Aarini a more reliable and intelligent health companion. Please provide as much detail as possible so we can squash this bug! 💜
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is.
+      placeholder: What happened? e.g. "The cycle length calculation is off by one day..."
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to Reproduce
+      description: How can we reproduce this bug?
+      placeholder: |
+        1. Go to the Tracking tab
+        2. Click on 'Log Period'
+        3. Select a date range
+        4. See error
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: A clear and concise description of what you expected to happen.
+    validations:
+      required: true
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platform
+      description: Where did you encounter this bug?
+      options:
+        - React Native (iOS)
+        - React Native (Android)
+        - Flask Backend API
+        - Firebase / Database
+    validations:
+      required: true
+  - type: checkboxes
+    id: security
+    attributes:
+      label: Privacy Check
+      description: Does this bug expose any private user health data or Firebase keys? If YES, please do NOT submit this issue publicly and reach out to the maintainer directly.
+      options:
+        - label: No, this is just a standard bug.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: ✨ Feature Request
+description: Suggest an idea to make Aarini even better
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ### 🌸 Welcome to Aarini!
+        We believe the best health tools are built by diverse, passionate communities. Thank you for your idea to help Aarini empower women's hormonal wellness! 💜
+  - type: textarea
+    id: description
+    attributes:
+      label: Feature Description
+      description: A clear and concise description of the feature you are requesting.
+      placeholder: e.g. "I would like to see an integration for wearable devices to sync heart rate data..."
+    validations:
+      required: true
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem it Solves
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: e.g. "Currently, I have to manually log my sleep, which is frustrating because..."
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+    validations:
+      required: false