feat: Complete backend and docs rebrand from Patherly to ResolutionFlow

Update APP_NAME, OpenAPI metadata, log messages, root endpoint response,
model docstrings, seed script comments, README heading, and CLAUDE.md
branding references. Frontend rebrand was completed in PR #26; this
covers everything else.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/scripts/seed_data.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 """
-Seed data script for Patherly decision trees.
+Seed data script for ResolutionFlow decision trees.
 
 This script creates example troubleshooting trees in the database.
 Run from the backend directory with: python -m scripts.seed_data
@@ -406,7 +406,7 @@ async def create_tree(client: httpx.AsyncClient, token: str, tree_data: dict) ->
 
 async def seed_database():
     """Main seeding function."""
-    print("\n[*] Patherly Database Seeder")
+    print("\n[*] ResolutionFlow Database Seeder")
     print("=" * 50)
 
     async with httpx.AsyncClient(timeout=30.0) as client:
@@ -458,7 +458,7 @@ async def seed_database():
 
 
 def main():
-    parser = argparse.ArgumentParser(description="Seed the Patherly database with example trees")
+    parser = argparse.ArgumentParser(description="Seed the ResolutionFlow database with example trees")
     parser.add_argument("--direct", action="store_true", help="Insert directly to database (not implemented)")
     args = parser.parse_args()