rebrand: rename AutoCoder to AutoForge across entire codebase

Complete project rebrand from AutoCoder to AutoForge, touching 62 files
across Python backend, FastAPI server, React UI, documentation, config,
and CI/CD.

Key changes:
- Rename autocoder_paths.py -> autoforge_paths.py with backward-compat
  migration from .autocoder/ -> .autoforge/ directories
- Update registry.py to migrate ~/.autocoder/ -> ~/.autoforge/ global
  config directory with fallback support
- Update security.py with fallback reads from legacy .autocoder/ paths
- Rename .claude/commands and skills from gsd-to-autocoder-spec to
  gsd-to-autoforge-spec
- Update all Python modules: client, prompts, progress, agent,
  orchestrator, server routers and services
- Update React UI: package.json name, index.html title, localStorage
  keys, all documentation sections, component references
- Update start scripts (bat/sh/py), examples, and .env.example
- Update CLAUDE.md and README.md with new branding and paths
- Update test files for new .autoforge/ directory structure
- Transfer git remote from leonvanzyl/autocoder to
  AutoForgeAI/autoforge

Backward compatibility preserved: legacy .autocoder/ directories are
auto-detected and migrated on next agent start. Config fallback chain
checks both new and old paths.

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

progress.py

@@ -46,7 +46,7 @@ def has_features(project_dir: Path) -> bool:
         return True
 
     # Check SQLite database
-    from autocoder_paths import get_features_db_path
+    from autoforge_paths import get_features_db_path
     db_file = get_features_db_path(project_dir)
     if not db_file.exists():
         return False
@@ -72,7 +72,7 @@ def count_passing_tests(project_dir: Path) -> tuple[int, int, int]:
     Returns:
         (passing_count, in_progress_count, total_count)
     """
-    from autocoder_paths import get_features_db_path
+    from autoforge_paths import get_features_db_path
     db_file = get_features_db_path(project_dir)
     if not db_file.exists():
         return 0, 0, 0
@@ -122,7 +122,7 @@ def get_all_passing_features(project_dir: Path) -> list[dict]:
     Returns:
         List of dicts with id, category, name for each passing feature
     """
-    from autocoder_paths import get_features_db_path
+    from autoforge_paths import get_features_db_path
     db_file = get_features_db_path(project_dir)
     if not db_file.exists():
         return []
@@ -147,7 +147,7 @@ def send_progress_webhook(passing: int, total: int, project_dir: Path) -> None:
     if not WEBHOOK_URL:
         return  # Webhook not configured
 
-    from autocoder_paths import get_progress_cache_path
+    from autoforge_paths import get_progress_cache_path
     cache_file = get_progress_cache_path(project_dir)
     previous = 0
     previous_passing_ids = set()