chore: add issue templates

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug report
+description: Something isn't working as expected
+labels: [bug]
+body:
+  - type: textarea
+    id: what
+    attributes:
+      label: What's broken?
+      description: Describe what's not working.
+    validations:
+      required: true
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to reproduce
+      description: Numbered list, ideally with commit hash + chain ID + URL.
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+  - type: input
+    id: version
+    attributes:
+      label: Version / commit
+      placeholder: v2.1.85 / abc1234

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Security vulnerability
+    url: mailto:security@sentriscloud.com
+    about: Report a security issue privately. Do NOT open a public issue.
+  - name: Sentrix Discord
+    url: https://discord.gg/sentrixchain
+    about: General questions and support

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature request
+description: Suggest something new
+labels: [enhancement]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem does this solve?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed approach
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered