docs: add issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a reproducible product, API, or operations bug.
+title: "[Bug]: "
+labels: ["bug", "needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for helping improve yedir-ai.
+
+        Do not include secrets, cookies, Authorization headers, OAuth codes, signed URLs, `.env.local` values, private prompts, base64 data, or private user content. If this is a security issue, do not open a public issue. Follow `SECURITY.md` instead.
+
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: What happened, and what did you expect instead?
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Reproduction steps
+      description: Provide the smallest reliable reproduction.
+      placeholder: |
+        1. Go to ...
+        2. Click ...
+        3. Observe ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: impact
+    attributes:
+      label: Impact
+      description: Who is affected and how severe is it?
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Browser, OS, deployment target, Node/pnpm versions, or route/API involved.
+      placeholder: |
+        Browser:
+        OS:
+        Node:
+        pnpm:
+        Route/API:
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Sanitized logs or screenshots
+      description: Include only sanitized output. Remove prompts, URLs, tokens, cookies, headers, base64, and private content.
+
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Pre-submit checklist
+      options:
+        - label: I removed secrets, tokens, signed URLs, cookies, private prompts, and private user content.
+          required: true
+        - label: I searched existing issues and docs before filing this.
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Security vulnerability
+    url: https://github.com/lanmu1818-ship-it/ai-chatbot/blob/main/SECURITY.md
+    about: Do not open public issues for vulnerabilities. Follow SECURITY.md and report privately to the project maintainer.
+  - name: Release readiness and contribution rules
+    url: https://github.com/lanmu1818-ship-it/ai-chatbot/blob/main/CONTRIBUTING.md
+    about: Read docs/release-readiness.md and CONTRIBUTING.md before opening broad engineering requests.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Propose a product, workflow, integration, or engineering improvement.
+title: "[Feature]: "
+labels: ["enhancement", "needs-triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please keep proposals focused and avoid sharing private customer data, prompts, screenshots with secrets, or provider credentials.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or opportunity
+      description: What user, operator, or developer problem does this solve?
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: Describe the behavior, API, UI, or documentation change.
+    validations:
+      required: true
+
+  - type: dropdown
+    id: area
+    attributes:
+      label: Area
+      options:
+        - Lovart home
+        - Canvas / Agent
+        - Image or video generation
+        - 3D / CAD
+        - Settings / admin
+        - API / backend
+        - Performance
+        - Security / observability
+        - Documentation / CI
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: What other approaches did you consider?
+
+  - type: textarea
+    id: acceptance
+    attributes:
+      label: Acceptance criteria
+      description: How should reviewers verify that this is done?
+      placeholder: |
+        - ...
+        - ...
+
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Pre-submit checklist
+      options:
+        - label: This request does not include real secrets, private prompts, signed URLs, or private user data.
+          required: true
+        - label: I checked the README, release readiness notes, and existing issues first.
+          required: true