Restructure src/ modules with consistent internal organization

Reorganize major src/ directories to follow a consistent pattern with
core/, menu/, submenu/, inputs/, logs/, layout/, feedback/ subdirectories.

Changes by module:

- stores/: Move 5 store files to stores/core/
- utils/: Create core/ (terminal, tools, etc.) and menu/ (progress-bar)
- api/: Create copilot/core/, copilot/auth/, ollama/core/
- providers/: Create core/, copilot/core/, copilot/auth/, ollama/core/, login/core/
- ui/: Create core/, banner/core/, banner/menu/, spinner/core/,
       input-editor/core/, components/core/, components/menu/
- tools/: Create core/ for registry.ts and types.ts
- tui-solid/: Reorganize components/ into menu/, submenu/, inputs/,
              logs/, modals/, panels/, layout/, feedback/
- commands/: Create core/ for runner.ts and handlers.ts
- services/: Create core/ for agent.ts, permissions.ts, session.ts,
             executor.ts, config.ts

All imports updated to use new paths. TypeScript compilation verified.

src/commands/handlers/classify.ts

@@ -9,7 +9,7 @@ import {
   errorMessage,
   failSpinner,
   headerMessage,
-} from "@utils/terminal";
+} from "@utils/core/terminal";
 import {
   INTENT_KEYWORDS,
   CLASSIFICATION_CONFIDENCE,

src/commands/handlers/config.ts

@@ -9,8 +9,8 @@ import {
   hightLigthedJson,
   headerMessage,
   infoMessage,
-} from "@utils/terminal";
-import { getConfig } from "@services/config";
+} from "@utils/core/terminal";
+import { getConfig } from "@services/core/config";
 import {
   VALID_CONFIG_KEYS,
   VALID_PROVIDERS,

src/commands/handlers/plan.ts

@@ -12,7 +12,7 @@ import {
   startSpinner,
   succeedSpinner,
   successMessage,
-} from "@utils/terminal";
+} from "@utils/core/terminal";
 import type { CommandOptions } from "@/types/index";
 
 export const handlePlan = async (options: CommandOptions): Promise<void> => {

src/commands/handlers/run.ts

@@ -2,7 +2,7 @@
  * Run command handler
  */
 
-import { execute } from "@commands/runner";
+import { execute } from "@commands/core/runner";
 import type { CommandOptions } from "@/types/index";
 
 export const handleRun = async (options: CommandOptions): Promise<void> => {

src/commands/handlers/serve.ts

@@ -2,7 +2,7 @@
  * Serve command handler
  */
 
-import { boxMessage, warningMessage, infoMessage } from "@utils/terminal";
+import { boxMessage, warningMessage, infoMessage } from "@utils/core/terminal";
 import type { CommandOptions } from "@/types/index";
 import { SERVER_INFO } from "@constants/serve";
 

src/commands/handlers/validate.ts

@@ -12,8 +12,8 @@ import {
   errorMessage,
   headerMessage,
   filePath,
-} from "@utils/terminal";
-import { getConfig } from "@services/config";
+} from "@utils/core/terminal";
+import { getConfig } from "@services/core/config";
 import type { CommandOptions } from "@/types/index";
 
 export const handleValidate = async (