docs: amend constitution to v1.6.0 (add 'Everything is a Plugin' principle) and refactor 010 plan

specs/010-refactor-cli-to-web/tasks.md

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+# Tasks: Refactor CLI Scripts to Web Application
+
+**Feature**: Refactor CLI Scripts to Web Application
+**Status**: Pending
+**Spec**: [specs/010-refactor-cli-to-web/spec.md](specs/010-refactor-cli-to-web/spec.md)
+
+## Phase 1: Core & Infrastructure
+*Goal: Enhance TaskManager to support returning results and set up Connection management.*
+
+- [ ] T001 Create `backend/src/models/connection.py` with `ConnectionConfig` model (ensure secure storage of credentials)
+- [ ] T002 Update `backend/src/core/task_manager/models.py` to add `result: Optional[Dict[str, Any]]` field to `Task` model
+- [ ] T003 Update `backend/src/core/task_manager/manager.py` to capture `plugin.execute` return value and store it in `task.result`
+- [ ] T004 [P] Create `frontend/src/services/toolsService.js` for generic Task API communication (run task, poll status, get result)
+- [ ] T005 [P] Create `frontend/src/services/connectionService.js` for Connection API
+- [ ] T006 Create `frontend/src/components/tools/` directory structure
+
+## Phase 2: User Story 1 - Search Datasets
+*Goal: Enable users to search datasets via the Web UI using a Plugin.*
+
+- [ ] T007 [US1] Implement `SearchPlugin` in `backend/src/plugins/search.py` (port logic from `search_script.py`, return results)
+- [ ] T008 [US1] Create `frontend/src/components/tools/SearchTool.svelte` component (triggers SearchPlugin, displays results)
+- [ ] T009 [US1] Create `frontend/src/routes/tools/search/+page.svelte` page
+
+## Phase 3: User Story 2 - Map Dataset Columns
+*Goal: Enable users to map columns using saved connections via a Plugin.*
+
+- [ ] T010 [US2] Create API endpoints for Connections (`GET`, `POST`, `DELETE`) in `backend/src/api/routes/connections.py`
+- [ ] T011 [US2] Register `connections` router in `backend/src/api/routes/__init__.py`
+- [ ] T012 [US2] Implement `MapperPlugin` in `backend/src/plugins/mapper.py` (port logic from `run_mapper.py`, support `connection_id`)
+- [ ] T013 [US2] Create `frontend/src/components/tools/ConnectionForm.svelte` and `ConnectionList.svelte`
+- [ ] T014 [US2] Create `frontend/src/routes/settings/connections/+page.svelte` for managing connections
+- [ ] T015 [US2] Create `frontend/src/components/tools/MapperTool.svelte` component
+- [ ] T016 [US2] Create `frontend/src/routes/tools/mapper/+page.svelte` page
+
+## Phase 4: User Story 3 - System Debugging
+*Goal: Enable users to run system diagnostics via a Plugin.*
+
+- [ ] T017 [US3] Implement `DebugPlugin` in `backend/src/plugins/debug.py` (port logic from `debug_db_api.py`, `get_dataset_structure.py`)
+- [ ] T018 [US3] Create `frontend/src/components/tools/DebugTool.svelte` component
+- [ ] T019 [US3] Create `frontend/src/routes/tools/debug/+page.svelte` page
+
+## Phase 5: Cleanup & Polish
+*Goal: Remove legacy scripts and ensure system stability.*
+
+- [ ] T020 Verify all new tools are functional (Manual Test)
+- [ ] T021 Verify existing Backup functionality fully covers legacy `backup_script.py` capabilities
+- [ ] T022 Remove legacy script `search_script.py`
+- [ ] T023 Remove legacy script `run_mapper.py`
+- [ ] T024 Remove legacy script `debug_db_api.py`
+- [ ] T025 Remove legacy script `get_dataset_structure.py`
+- [ ] T026 Remove legacy script `backup_script.py`
+- [ ] T027 Update main navigation in `frontend/src/components/Navbar.svelte` to include "Tools" dropdown
+
+## Dependencies
+
+- Phase 2 (Search) depends on Phase 1 (Task Result support)
+- Phase 3 (Mapper) depends on Phase 1 (Connection Model)
+- Phase 4 (Debug) depends on Phase 1 (Task Result support)
+- Phase 5 (Cleanup) depends on Phase 2, 3, 4 completion
+
+## Implementation Strategy
+
+1.  **Core**: Upgrade TaskManager first to support return values.
+2.  **Search**: Implement SearchPlugin as the first "Result-returning" plugin.
+3.  **Connections**: Build connection management.
+4.  **Mapper**: Implement MapperPlugin using Connections.
+5.  **Debug**: Implement DebugPlugin.
+6.  **Cleanup**: Verify and delete.