refactor: implement full projects CRUD, move icons onto tag schema

- Remove priority field and sorting, switch to updated_at DESC
- Add icon field to tags table
- Split project description into name and short_description
- Implement full CRUD for projects (create, update, delete)
- Add admin stats endpoint (project counts by status)

.sqlx/query-46df2723810fa84cd1c2f228b5052f91c2bb0a2cd2025366ac2af0cb0717e7d5.json

@@ -0,0 +1,52 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "\n        SELECT t.id, t.slug, t.name, t.icon, t.color, t.created_at\n        FROM tags t\n        JOIN project_tags pt ON t.id = pt.tag_id\n        WHERE pt.project_id = $1\n        ORDER BY t.name ASC\n        ",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 1,
+        "name": "slug",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 2,
+        "name": "name",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 3,
+        "name": "icon",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 4,
+        "name": "color",
+        "type_info": "Varchar"
+      },
+      {
+        "ordinal": 5,
+        "name": "created_at",
+        "type_info": "Timestamptz"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Uuid"
+      ]
+    },
+    "nullable": [
+      false,
+      false,
+      false,
+      true,
+      true,
+      false
+    ]
+  },
+  "hash": "46df2723810fa84cd1c2f228b5052f91c2bb0a2cd2025366ac2af0cb0717e7d5"
+}