✨ feat(concepts): add new categories for fundamental topics

- create category for "Foundamental Problem Domains" with description
- create category for "Algorithm Design Paradigms" with description
- create category for "State Space Search and Optimization" with description
- create category for "Advanced Execution Models" with description

Author: vicegd

concepts/02-foundamental-problem-domains/_category_.json

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+{
+  "label": "2. Foundamental Problem Domains",
+  "link": {
+    "type": "generated-index",
+    "description": "Explore fundamental problem domains and their algorithmic solutions."
+  }
+}

concepts/03-algorithm-design-paradigms/_category_.json

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+{
+  "label": "3. Algorithm Design Paradigms",
+  "link": {
+    "type": "generated-index",
+    "description": "Explore various algorithm design approaches and their applications in solving complex computational problems."
+  }
+}

concepts/04-state-space-search-and-optimization/_category_.json

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+{
+  "label": "4. State Space Search and Optimization",
+  "link": {
+    "type": "generated-index",
+    "description": "Explore state space search techniques and optimization strategies for solving complex computational problems."
+  }
+}

concepts/05-advanced-execution-models/_category_.json

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+{
+  "label": "5. Advanced Execution Models",
+  "link": {
+    "type": "generated-index",
+    "description": "Explore advanced execution models and their applications in modern computing environments."
+  }
+}