feat: Add extensible multi-pipeline integration system

This commit implements a plugin-like pipeline architecture with:

Pipeline Core Package (packages/pipeline-core/):
- BasePipeline abstract class all pipelines implement
- PipelineRegistry for database-backed discovery/management
- PipelineRunner for execution with status tracking
- DashboardConfig contracts for dynamic widget definitions

Database Migration (006_pipeline_registry.sql):
- pipeline.registry table for registered pipelines
- pipeline.executions table for execution history
- Views for execution stats and monitoring

ReviewIQ Pipeline Refactor:
- Implements BasePipeline interface
- Adds get_dashboard_config() with widget definitions
- Adds get_widget_data() methods for all dashboard widgets
- Maintains backward compatibility with Pipeline alias

Generic Pipeline API (api/routes/pipelines.py):
- GET /api/pipelines - List all registered pipelines
- GET /api/pipelines/{id} - Pipeline details
- POST /api/pipelines/{id}/execute - Execute pipeline
- GET /api/pipelines/{id}/dashboard - Dashboard config
- GET /api/pipelines/{id}/widgets/{w} - Widget data
- GET /api/pipelines/{id}/executions - Execution history

Frontend Dynamic Dashboard System:
- DynamicDashboard component renders from config
- WidgetRegistry maps types to components
- Widget components: StatCard, LineChart, BarChart,
  PieChart, DataTable, Heatmap
- Pipeline API client library

Frontend Pipeline Pages:
- /pipelines - List all registered pipelines
- /pipelines/[id] - Dynamic dashboard for pipeline
- /pipelines/[id]/executions - Execution history
- Pipelines nav item in Sidebar

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

web/lib/pipeline-types.ts

@@ -0,0 +1,194 @@
+/**
+ * TypeScript types for the pipeline system.
+ *
+ * These types mirror the Python contracts in pipeline_core/contracts.py
+ */
+
+// Widget types supported by the dashboard
+export type WidgetType =
+  | 'stat_card'
+  | 'line_chart'
+  | 'bar_chart'
+  | 'pie_chart'
+  | 'table'
+  | 'heatmap'
+  | 'area_chart'
+  | 'gauge';
+
+// Grid position for dashboard layout
+export interface GridPosition {
+  x: number;
+  y: number;
+  w: number;
+  h: number;
+}
+
+// Widget configuration
+export interface WidgetConfig {
+  id: string;
+  type: WidgetType;
+  title: string;
+  grid: GridPosition;
+  config: Record<string, unknown>;
+  data_endpoint?: string;
+  refresh_interval?: number;
+}
+
+// Dashboard section containing widgets
+export interface DashboardSection {
+  id: string;
+  title: string;
+  description?: string;
+  widgets: WidgetConfig[];
+  collapsed?: boolean;
+}
+
+// Full dashboard configuration
+export interface DashboardConfig {
+  pipeline_id: string;
+  title: string;
+  description?: string;
+  sections: DashboardSection[];
+  default_time_range?: string;
+  refresh_interval?: number;
+}
+
+// Pipeline info (summary)
+export interface PipelineInfo {
+  id: string;
+  name: string;
+  description: string;
+  version: string;
+  is_enabled: boolean;
+  stages: string[];
+  input_type: string;
+}
+
+// Pipeline detail (full info)
+export interface PipelineDetail extends PipelineInfo {
+  module_path: string;
+  config?: Record<string, unknown>;
+  created_at?: string;
+  updated_at?: string;
+}
+
+// Execution status
+export interface ExecutionStatus {
+  id: string;
+  pipeline_id: string;
+  job_id?: string;
+  business_id?: string;
+  status: 'pending' | 'running' | 'completed' | 'failed' | 'cancelled';
+  stages_requested: string[];
+  stages_completed: string[];
+  current_stage?: string;
+  progress: number;
+  error_message?: string;
+  started_at?: string;
+  completed_at?: string;
+  created_at?: string;
+}
+
+// Widget-specific data types
+
+export interface StatCardData {
+  [key: string]: number | string;
+}
+
+export interface ChartDataPoint {
+  [key: string]: number | string;
+}
+
+export interface ChartData {
+  data: ChartDataPoint[];
+}
+
+export interface TableData {
+  data: Record<string, unknown>[];
+  total: number;
+}
+
+export type WidgetData = StatCardData | ChartData | TableData;
+
+// Widget props base
+export interface WidgetProps {
+  config: WidgetConfig;
+  data: WidgetData | null;
+  loading: boolean;
+  error?: string;
+  onRefresh?: () => void;
+}
+
+// Stat card specific config
+export interface StatCardConfig {
+  value_key: string;
+  label?: string;
+  format?: string;
+  trend_key?: string;
+  trend_format?: string;
+  icon?: string;
+  color?: string;
+}
+
+// Chart config
+export interface ChartAxisConfig {
+  key: string;
+  label?: string;
+  type?: 'number' | 'category' | 'time';
+  format?: string;
+}
+
+export interface ChartSeriesConfig {
+  key: string;
+  name: string;
+  color?: string;
+  type?: 'line' | 'bar' | 'area';
+}
+
+export interface ChartWidgetConfig {
+  x_axis: ChartAxisConfig;
+  y_axis: ChartAxisConfig;
+  series: ChartSeriesConfig[];
+  stacked?: boolean;
+  show_legend?: boolean;
+  show_grid?: boolean;
+}
+
+// Pie chart config
+export interface PieChartConfig {
+  value_key: string;
+  label_key: string;
+  colors?: string[];
+  show_legend?: boolean;
+  show_labels?: boolean;
+  inner_radius?: number;
+}
+
+// Table config
+export interface TableColumnConfig {
+  key: string;
+  header: string;
+  width?: number;
+  align?: 'left' | 'center' | 'right';
+  format?: string;
+  sortable?: boolean;
+}
+
+export interface TableWidgetConfig {
+  columns: TableColumnConfig[];
+  row_key: string;
+  page_size?: number;
+  show_pagination?: boolean;
+  sortable?: boolean;
+  filterable?: boolean;
+}
+
+// Heatmap config
+export interface HeatmapConfig {
+  x_key: string;
+  y_key: string;
+  value_key: string;
+  color_scale?: string[];
+  show_values?: boolean;
+  format?: string;
+}