refactor(config): adopt config-loader-facade across the codebase

Issue #1161. Sweeps 127 files to import from
src/config/config-loader-facade.ts instead of unified-config-loader or
utils/config-manager directly.

WRITE callers (32 files): replaced raw saveUnifiedConfig /
mutateUnifiedConfig / updateUnifiedConfig calls with the facade's
cache-coherent wrappers saveConfig / mutateConfig / updateConfig. This
fixes a latent stale-cache window where direct writes through the
underlying loader bypassed the facade's memoization.

READ callers (95 files): mechanical import-path migration only —
function names unchanged because the facade re-exports them. No
behavior change.

Also updated:
- tests/unit/utils/browser/browser-setup.test.ts (DI interface rename)
- src/management/checks/image-analysis-check.ts (dynamic import rename)
- src/web-server/health-service.ts (dynamic require rename)
- src/ccs.ts (path prefix fix from sweep script)

After sweep: zero raw write callers remain outside src/config/. Direct
imports of config-manager remain only for symbols not in the facade
(getConfigPath, getCcsDirSource, etc). Behavior unchanged; full suite
passes 1824/1824.

Out of scope: switching loadOrCreateUnifiedConfig() callers to
getCachedConfig() — needs per-callsite cache-safety analysis. Tracked
as follow-up.

Refs #1161

src/copilot/copilot-executor.ts

@@ -7,7 +7,7 @@
 
 import { spawn } from 'child_process';
 import { CopilotConfig } from '../config/unified-config-types';
-import { getGlobalEnvConfig } from '../config/unified-config-loader';
+
 import { ensureCliproxyService } from '../cliproxy';
 import { getEffectiveApiKey } from '../cliproxy/auth/auth-token-manager';
 import { CLIPROXY_DEFAULT_PORT } from '../cliproxy/config/port-manager';
@@ -36,6 +36,7 @@ import {
 } from '../utils/hooks';
 import { stripClaudeCodeEnv } from '../utils/shell-executor';
 import { createLogger } from '../services/logging';
+import { getGlobalEnvConfig } from '../config/config-loader-facade';
 
 const logger = createLogger('copilot:executor');