feat(ai): implement unified prompt management UX/UI (ADR-037)

- Add context config endpoints (GET/PUT /api/ai/prompts/:type/:version/context-config)
- Add execution profile endpoints (CRUD /api/ai/execution-profiles)
- Add sandbox RAG Prep endpoint (POST /api/ai/admin/sandbox/rag-prep)
- Create Prompt Management UI with multi-type support
- Add ContextConfigEditor, PromptEditor, RuntimeParametersPanel components
- Add SandboxTabs for 3-step workflow (OCR, Extract, RAG Prep)
- Add database deltas for ai_execution_profiles and additional prompt types
- Update quickstart.md with production backend URLs
- Add comprehensive test coverage for new features

frontend/contracts/frontend-types.ts

@@ -0,0 +1,102 @@
+// File: frontend/contracts/frontend-types.ts
+// Change Log:
+// - 2026-06-14: Created frontend contract types from specifications (conforming to task T010)
+
+export type PromptType = 'ocr_extraction' | 'rag_query_prompt' | 'rag_prep_prompt' | 'classification_prompt';
+
+export interface ContextConfig {
+  filter: {
+    projectId: string | null;
+    contractId: string | null;
+  };
+  pageSize: number;
+  language: string;
+  outputLanguage: string;
+}
+
+export interface PromptVersion {
+  id: string;
+  promptType: PromptType;
+  versionNumber: number;
+  template: string;
+  contextConfig: ContextConfig | null;
+  isActive: boolean;
+  manualNote: string | null;
+  createdAt: string;
+}
+
+export interface RuntimeParameters {
+  temperature: number;
+  topP: number;
+  repeatPenalty: number;
+  maxTokens: number;
+  ctxSize: number;
+  keepAlive: number;
+}
+
+export interface ExecutionProfile {
+  id: string;
+  profileName: string;
+  temperature: number;
+  topP: number;
+  repeatPenalty: number;
+  maxTokens: number;
+  ctxSize: number;
+  keepAlive: number;
+  isDefault: boolean;
+}
+
+export type SandboxJobType = 'ocr' | 'ai-extract' | 'rag-prep';
+export type SandboxJobStatus = 'pending' | 'processing' | 'completed' | 'failed';
+
+export interface SandboxJobResult {
+  ocrText?: string;
+  extractedMetadata?: Record<string, unknown>;
+  ragChunks?: Array<{
+    text: string;
+    summary: string;
+  }>;
+  ragVectors?: number[][];
+  error?: string | null;
+}
+
+export interface SandboxJob {
+  jobId: string;
+  jobType: SandboxJobType;
+  status: SandboxJobStatus;
+  result: SandboxJobResult;
+  createdAt: string;
+  completedAt?: string;
+}
+
+export interface CreatePromptDto {
+  template: string;
+  contextConfig: ContextConfig;
+  manualNote?: string;
+}
+
+export interface UpdateContextConfigDto {
+  filter: {
+    projectId: string | null;
+    contractId: string | null;
+  };
+  pageSize: number;
+  language: string;
+  outputLanguage: string;
+}
+
+export const PLACEHOLDER_REQUIREMENTS: Record<PromptType, string[]> = {
+  ocr_extraction: ['{{ocr_text}}', '{{master_data_context}}'],
+  rag_query_prompt: ['{{query}}', '{{context}}'],
+  rag_prep_prompt: ['{{text}}'],
+  classification_prompt: ['{{document_text}}'],
+};
+
+export const RUNTIME_PARAMETER_CONSTRAINTS = {
+  temperature: { min: 0.0, max: 1.0, default: 0.7 },
+  topP: { min: 0.0, max: 1.0, default: 0.9 },
+  repeatPenalty: { min: 1.0, max: 2.0, default: 1.0 },
+  maxTokens: { min: 1, max: 8192, default: 2048 },
+  ctxSize: { min: 1, max: 16384, default: 4096 },
+  keepAlive: { min: 0, max: 3600, default: 300 },
+};