feat: add security policy and issue templates

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: 🐛 Bug Report
+description: Create a report to help us improve AutoRedact
+title: "[Bug]: "
+labels: ["bug", "triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+      placeholder: When I upload a PDF, the screen turns blank...
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to reproduce
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll down to '...'
+        4. See error
+    validations:
+      required: true
+  - type: dropdown
+    id: browser
+    attributes:
+      label: Browser
+      options:
+        - Chrome
+        - Firefox
+        - Safari
+        - Edge
+        - Other
+    validations:
+      required: true
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platform
+      options:
+        - Desktop (macOS)
+        - Desktop (Windows)
+        - Desktop (Linux)
+        - Mobile (iOS/Android)
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Screenshots or Console Logs
+      description: Paste any console errors (F12) or screenshots here.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: 💡 Feature Request
+description: Suggest an idea or enhancement for AutoRedact
+title: "[Feat]: "
+labels: ["enhancement", "triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for asking for a new feature! Please search existing issues first.
+  - type: textarea
+    id: problem
+    attributes:
+      label: Is your feature request related to a problem?
+      description: A clear and concise description of what the problem is.
+      placeholder: I'm always frustrated when...
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you want to happen.
+      placeholder: I want a button that auto-downloads all images as ZIP...
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+AutoRedact is an aggressive release project. **We only support the latest release.**
+
+| Version | Supported          |
+| ------- | ------------------ |
+| Latest  | :white_check_mark: |
+| < 1.0.0 | :x:                |
+
+If you are running an older version, please upgrade immediately. We do not backport security fixes to older versions.
+
+## Reporting a Vulnerability
+
+We take security seriously. If you discover a security vulnerability in AutoRedact, please follow these steps to report it responsibly:
+
+### ⛔ DO NOT OPEN A PUBLIC ISSUE
+
+Publicly reporting a vulnerability can put the community at risk before a fix is available.
+
+### ✅ Private Reporting (Recommended)
+
+We use **GitHub Private Vulnerability Reporting**. This allows you to open a private advisory directly in this repository.
+
+1.  Go to the **Security** tab.
+2.  Click **"Report a vulnerability"** (green button).
+3.  Fill in the details.