feat: add structured issue templates and security workflow

- Add bug report template with platform, version, and reproduction steps
- Add feature request template with priority and context fields
- Add CodeQL security analysis workflow
- Add dependency review for pull requests

Author: grdsdev

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,81 @@
+name: Bug Report
+description: File a bug report to help us improve
+title: "[Bug]: "
+labels: ["bug", "triage"]
+assignees: []
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: What version of supabase-swift are you running?
+      placeholder: ex. 2.31.2
+    validations:
+      required: true
+
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platform
+      description: What platform are you using?
+      options:
+        - iOS
+        - macOS
+        - tvOS
+        - watchOS
+        - visionOS
+        - Linux
+        - Other
+    validations:
+      required: true
+
+  - type: input
+    id: swift-version
+    attributes:
+      label: Swift Version
+      description: What version of Swift are you using?
+      placeholder: ex. 5.10
+    validations:
+      required: true
+
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Also tell us, what did you expect to happen?
+      placeholder: Tell us what you see!
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to Reproduce
+      description: Please provide clear steps to reproduce the issue
+      placeholder: |
+        1. Import Supabase
+        2. Create client with '...'
+        3. Call method '...'
+        4. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: code-sample
+    attributes:
+      label: Code Sample
+      description: Please provide a minimal code sample that reproduces the issue
+      render: swift
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: shell

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea for supabase-swift
+title: "[Feature]: "
+labels: ["enhancement", "triage"]
+assignees: []
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a new feature! Please fill out the sections below.
+
+  - type: checkboxes
+    id: search
+    attributes:
+      label: Searched existing issues?
+      description: Please search existing issues to avoid duplicates
+      options:
+        - label: I have searched the existing issues
+          required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Description
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like
+      placeholder: I would like to see...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternative Solutions
+      description: Describe any alternative solutions or features you've considered
+
+  - type: dropdown
+    id: priority
+    attributes:
+      label: Priority
+      description: How important is this feature to you?
+      options:
+        - Low - Nice to have
+        - Medium - Would significantly improve my workflow
+        - High - Blocking my use case
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Add any other context, screenshots, or examples about the feature request

.github/workflows/security.yml

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+name: Security
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    - cron: '0 0 * * 1'  # Weekly on Mondays
+
+permissions:
+  actions: read
+  contents: read
+  security-events: write
+
+jobs:
+  codeql:
+    name: CodeQL Analysis
+    runs-on: ubuntu-latest
+    timeout-minutes: 360
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ swift ]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+          queries: +security-and-quality
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v3
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: "/language:${{matrix.language}}"
+
+  dependency-review:
+    name: Dependency Review
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Dependency Review
+        uses: actions/dependency-review-action@v4
+        with:
+          fail-on-severity: moderate