chore(github): add issue forms for resources, link problems and roadmap changes

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Contributing guidelines
+    url: https://github.com/m3y54m/Embedded-Engineering-Roadmap/blob/master/CONTRIBUTING.md
+    about: Read these before suggesting a resource or opening a pull request.

.github/ISSUE_TEMPLATE/report-link-problem.yml

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+name: Report a link problem
+description: A link is broken, moved, mislabeled, off-topic or in the wrong section
+title: "[Link] "
+labels: ["link-problem"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Use this form for any problem with an existing entry. Select every problem that applies.
+        If you already know the fix, a pull request is welcome too.
+  - type: input
+    id: entry
+    attributes:
+      label: Entry
+      description: The title or URL of the entry, and the section it is in.
+    validations:
+      required: true
+  - type: dropdown
+    id: problems
+    attributes:
+      label: What is wrong?
+      multiple: true
+      options:
+        - Link is broken (404, domain gone, site down)
+        - Link moved to a new address
+        - Link opens something different from its title
+        - Content is outdated
+        - Content is not related to the section it is in
+        - Wrong type marker or quality marker (📘 🎞️ 📝 🔗 👶 💎)
+        - Site is unsafe, spammy or requires an unexpected paywall
+        - Duplicate of another entry
+    validations:
+      required: true
+  - type: textarea
+    id: details
+    attributes:
+      label: Details
+      description: What you saw, and when. Include the error message if there is one.
+    validations:
+      required: true
+  - type: textarea
+    id: fix
+    attributes:
+      label: Suggested fix (optional)
+      description: A replacement link, a better section, the correct marker, or "remove it".

.github/ISSUE_TEMPLATE/suggest-resource.yml

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+name: Suggest a resource
+description: Propose a book, video, article or tool to add to the roadmap
+title: "[Resource] "
+labels: ["resource"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for contributing! Please read the [contributing guidelines](https://github.com/m3y54m/Embedded-Engineering-Roadmap/blob/master/CONTRIBUTING.md) first.
+        Free resources are preferred, and each entry needs a clear reason to be there.
+  - type: input
+    id: url
+    attributes:
+      label: Link
+      placeholder: https://
+    validations:
+      required: true
+  - type: input
+    id: title
+    attributes:
+      label: Title and author
+      description: As it should appear in the list, for example "Title - Author".
+    validations:
+      required: true
+  - type: dropdown
+    id: type
+    attributes:
+      label: Resource type
+      options:
+        - "📘 Book"
+        - "🎞️ Video"
+        - "📝 Article or blog post"
+        - "🔗 Other (tool, documentation, website)"
+        - "🎧 Audio book"
+    validations:
+      required: true
+  - type: input
+    id: section
+    attributes:
+      label: Section it belongs to
+      description: Heading in the README where it fits best. If you are not sure, describe the topic.
+      placeholder: "Microcontrollers > Interrupts"
+    validations:
+      required: true
+  - type: dropdown
+    id: level
+    attributes:
+      label: Audience
+      options:
+        - Beginner-friendly (👶)
+        - Intermediate
+        - Advanced
+        - Well-known, comprehensive reference (💎)
+      multiple: true
+    validations:
+      required: true
+  - type: dropdown
+    id: cost
+    attributes:
+      label: Cost
+      options:
+        - Free
+        - Free with registration
+        - Paid
+    validations:
+      required: true
+  - type: textarea
+    id: why
+    attributes:
+      label: Why should it be included?
+      description: If it is paid, explain why it is clearly better than the free options already listed.
+    validations:
+      required: true
+  - type: input
+    id: replaces
+    attributes:
+      label: Replaces an existing entry (optional)
+      description: Name or link of the entry this would replace, if any.

.github/ISSUE_TEMPLATE/suggest-topic-or-structure.yml

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+name: Suggest a topic or structure change
+description: Propose a new topic, a missing section, or a reorganization
+title: "[Roadmap] "
+labels: ["roadmap"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        New topics should be useful to other learners and fit the roadmap's structure. See the "Roadmap Alignment" section of the [contributing guidelines](https://github.com/m3y54m/Embedded-Engineering-Roadmap/blob/master/CONTRIBUTING.md).
+  - type: dropdown
+    id: kind
+    attributes:
+      label: What do you suggest?
+      multiple: true
+      options:
+        - Add a new topic or section
+        - Move or reorganize existing sections
+        - Change the roadmap diagram
+        - Improve the introduction or explanations
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposal
+      description: Describe the change and where it would go.
+    validations:
+      required: true
+  - type: textarea
+    id: why
+    attributes:
+      label: Why does it help learners?
+      description: Which skill or job role it covers, and why it is missing today.
+    validations:
+      required: true