Add tags prominence and SIM source grouping features

Database changes:
- Add sim_source_id column to artifacts table for grouping multiple artifacts
- Create Alembic migration (001_add_sim_source_id) for schema update
- Add Alembic env.py for migration support with environment-based DB URLs

API enhancements:
- Add sim_source_id parameter to upload endpoint
- Add sim_source_id filter to query endpoint
- Add new /grouped-by-sim-source endpoint for getting artifacts by group
- Update all API documentation to include sim_source_id

UI improvements:
- Make tags required field and more prominent in upload form
- Add tags display directly in artifacts table (below filename)
- Add SIM Source ID field in upload form with helper text for grouping
- Update table to show sim_source_id (falls back to test_suite if null)
- Tags now displayed as inline badges in main table view

Seed data updates:
- Generate sim_source_id for 70% of artifacts to demonstrate grouping
- Multiple artifacts can share same sim_source_id
- Improved seed data variety with tag combinations

Features:
- Tags are now prominently displayed in both table and detail views
- Multiple artifacts can be grouped by SIM source ID
- Users can filter/query by sim_source_id
- Backward compatible - existing artifacts without sim_source_id still work

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

static/index.html

@@ -109,6 +109,18 @@
                         </div>
                     </div>
 
+                    <div class="form-row">
+                        <div class="form-group">
+                            <label for="sim-source-id">SIM Source ID (for grouping)</label>
+                            <input type="text" id="sim-source-id" name="sim_source_id" placeholder="e.g., sim_run_20251015_001">
+                            <small>Use same ID for multiple artifacts from same source</small>
+                        </div>
+                        <div class="form-group">
+                            <label for="tags">Tags (comma-separated) *</label>
+                            <input type="text" id="tags" name="tags" placeholder="e.g., regression, smoke, critical" required>
+                        </div>
+                    </div>
+
                     <div class="form-row">
                         <div class="form-group">
                             <label for="test-result">Test Result</label>
@@ -126,11 +138,6 @@
                         </div>
                     </div>
 
-                    <div class="form-group">
-                        <label for="tags">Tags (comma-separated)</label>
-                        <input type="text" id="tags" name="tags" placeholder="e.g., regression, smoke, critical">
-                    </div>
-
                     <div class="form-group">
                         <label for="description">Description</label>
                         <textarea id="description" name="description" rows="3" placeholder="Describe this artifact..."></textarea>