feat: add modelcatalog_software_category junction table and Hasura metadata

Add software-to-category many-to-many relationship for sdm:hasModelCategory
on Software entities. Includes SQL migration with FK constraints, indexes,
and Hasura metadata with bidirectional relationships and permissions.

Author: mosoriob

metadata/tables.yaml

@@ -2897,6 +2897,13 @@
         table:
           name: modelcatalog_software_author
           schema: public
+  - name: categories
+    using:
+      foreign_key_constraint_on:
+        column: software_id
+        table:
+          name: modelcatalog_software_category
+          schema: public
   insert_permissions:
   - role: user
     permission:
@@ -3776,6 +3783,13 @@
         table:
           name: modelcatalog_software_version_category
           schema: public
+  - name: software_items
+    using:
+      foreign_key_constraint_on:
+        column: category_id
+        table:
+          name: modelcatalog_software_category
+          schema: public
   insert_permissions:
   - role: user
     permission:
@@ -4672,6 +4686,38 @@
   - role: user
     permission:
       filter: {}
+- table:
+    name: modelcatalog_software_category
+    schema: public
+  object_relationships:
+  - name: software
+    using:
+      foreign_key_constraint_on: software_id
+  - name: category
+    using:
+      foreign_key_constraint_on: category_id
+  insert_permissions:
+  - role: user
+    permission:
+      check: {}
+      columns: &id040
+      - software_id
+      - category_id
+  select_permissions:
+  - role: anonymous
+    permission:
+      columns:
+      - software_id
+      - category_id
+      filter: {}
+  - role: user
+    permission:
+      columns: *id040
+      filter: {}
+  delete_permissions:
+  - role: user
+    permission:
+      filter: {}
 - table:
     name: modelcatalog_version_author
     schema: public

migrations/1771200003000_modelcatalog_software_category/down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS modelcatalog_software_category;

migrations/1771200003000_modelcatalog_software_category/up.sql

@@ -0,0 +1,9 @@
+-- Software <-> ModelCategory junction table
+CREATE TABLE modelcatalog_software_category (
+    software_id TEXT REFERENCES modelcatalog_software(id) ON DELETE CASCADE,
+    category_id TEXT REFERENCES modelcatalog_model_category(id) ON DELETE CASCADE,
+    PRIMARY KEY (software_id, category_id)
+);
+
+CREATE INDEX idx_mc_sw_cat_sw ON modelcatalog_software_category(software_id);
+CREATE INDEX idx_mc_sw_cat_cat ON modelcatalog_software_category(category_id);