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>

server/main.py

@@ -94,7 +94,7 @@ logger = logging.getLogger(__name__)
 
 # Check if remote access is enabled via environment variable
 # Set by start_ui.py when --host is not 127.0.0.1
-ALLOW_REMOTE = os.environ.get("AUTOCODER_ALLOW_REMOTE", "").lower() in ("1", "true", "yes")
+ALLOW_REMOTE = os.environ.get("AUTOFORGE_ALLOW_REMOTE", "").lower() in ("1", "true", "yes")
 
 if ALLOW_REMOTE:
     logger.warning(
@@ -133,7 +133,7 @@ else:
 if not ALLOW_REMOTE:
     @app.middleware("http")
     async def require_localhost(request: Request, call_next):
-        """Only allow requests from localhost (disabled when AUTOCODER_ALLOW_REMOTE=1)."""
+        """Only allow requests from localhost (disabled when AUTOFORGE_ALLOW_REMOTE=1)."""
         client_host = request.client.host if request.client else None
 
         # Allow localhost connections