feat: Add issue templates for bug reports and feature requests, and update PR template

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,79 @@
+name: Bug report
+description: Report a reproducible bug
+title: "bug: "
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug.
+
+        If this is a security issue (auth bypass, token leak, file upload exploit, etc.), please follow SECURITY.md instead of filing a public issue.
+
+  - type: dropdown
+    id: component
+    attributes:
+      label: Affected component
+      options:
+        - Client (EchoHub.Client)
+        - Server (EchoHub.Server)
+        - Core/shared (EchoHub.Core)
+        - Docs
+        - CI
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+      description: Describe the bug and what you expected to happen.
+      placeholder: "When I..., I expected..., but ..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to reproduce
+      description: Include minimal, numbered steps.
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / stack traces
+      description: Paste relevant logs (redact tokens/secrets).
+      render: text
+
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: App version, commit SHA, or release tag.
+      placeholder: v0.1.0
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: OS, terminal, .NET SDK version.
+      placeholder: |
+        OS: Windows 11
+        Terminal: Windows Terminal
+        .NET SDK: 10.0.x
+
+  - type: checkboxes
+    id: confirmations
+    attributes:
+      label: Confirmations
+      options:
+        - label: I searched existing issues and this is not a duplicate
+          required: true
+        - label: I removed sensitive info (tokens/keys) from logs
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Security policy
+    url: https://github.com/HueByte/EchoHub/security/policy
+    about: Please report security vulnerabilities here (or see SECURITY.md).

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea or improvement
+title: "feat: "
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting an improvement.
+
+        EchoHub tries to stay lightweight: terminal-first, self-hosted, and no upsells.
+
+  - type: dropdown
+    id: area
+    attributes:
+      label: Area
+      options:
+        - Client (TUI)
+        - Server (API/SignalR)
+        - Auth/security
+        - Files/uploads
+        - Docs
+        - Build/CI
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem are you trying to solve?
+      placeholder: "It’s hard to..., because ..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      placeholder: "Add/Change ..., so that ..."
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Any other approaches you’ve thought about.
+
+  - type: textarea
+    id: extra
+    attributes:
+      label: Additional context
+      description: Mockups, examples, links, etc.