Add issue templates, social preview, and discussion links

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Report something that isn't working correctly
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting this! The more detail you can provide, the faster we can fix it.
+
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Describe what went wrong.
+      placeholder: "e.g., The clock keeps running after I click Stop"
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: What did you expect?
+      description: What should have happened instead?
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: How can we reproduce this? List the steps if you can.
+      placeholder: |
+        1. Open OBS
+        2. Start a game
+        3. ...
+
+  - type: input
+    id: obs-version
+    attributes:
+      label: OBS Studio version
+      placeholder: "e.g., 31.0.2"
+
+  - type: input
+    id: plugin-version
+    attributes:
+      label: Streamn Scoreboard version
+      placeholder: "e.g., v0.7.0"
+
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Operating system
+      options:
+        - macOS
+        - Windows
+        - Linux

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Questions & Help
+    url: https://github.com/StreamnDad/streamn-scoreboard/discussions/categories/q-a
+    about: Ask the community for help with setup, configuration, or usage.
+  - name: Show Your Setup
+    url: https://github.com/StreamnDad/streamn-scoreboard/discussions/categories/show-and-tell
+    about: Share screenshots or videos of your scoreboard overlay in action!

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to suggest an improvement!
+
+  - type: textarea
+    id: description
+    attributes:
+      label: What would you like to see?
+      description: Describe the feature or enhancement you have in mind.
+      placeholder: "e.g., Support for tracking overtime periods"
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Why is this useful?
+      description: How would this help your streaming or scorekeeping workflow?
+      placeholder: "e.g., Our league plays 5-minute sudden death OT and I currently have to..."
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives or workarounds
+      description: Have you found a workaround, or are there other tools that do this?
+
+  - type: dropdown
+    id: sport
+    attributes:
+      label: Sport
+      description: Which sport is this most relevant to?
+      options:
+        - Hockey
+        - Soccer
+        - Lacrosse
+        - Basketball
+        - Football
+        - Rugby
+        - Other / All sports