openapi-spec-reader (#10)

### Summary of Changes:
1.  **Spec-Driven Enums**:
    - Updated `openapi_loader.ts` to collect all standalone enum schemas (e.g., `FetchRequestStatus`) into the `AppConfig.enums` map.
    - Implemented `mergeProperties` and `oneOf`/`anyOf` resolution in `openapi_loader.ts` to ensure complex schemas like `FetchRequest` (using `allOf`) and `source` (using `oneOf`) are correctly parsed.
2.  **Customizable Labeling**:
    - Added `enumOption` (template-based) and `enumLabels` (mapping-based) to the config and field types.
    - Implemented `resolveTemplate` in `utils/options.ts` to handle placeholders like `'{name} {number}'` or plain field names.
3.  **UI Integration**:
    - **`FormField.tsx`**: Updated relation and enum selects to use `getFieldOptions()` for correct key/value pairs and labels. Added value normalization to extract keys from API objects.
    - **`EnhancedTable.tsx`**: Updated `valueOptions` to use key/value pairs for `singleSelect` and updated `FieldRenderer` to show the human-readable label for enums.
    - **`FilterBar.tsx`**: Updated `extractOptions` to use spec-driven labels for enum filters.
    - **`ResourceView.tsx`**: Centralized filter matching logic into a `getDisplayString` helper, ensuring filter comparisons use the same templates as the UI labels.
4. **App Fixes**:
    - `FetchRequests.tsx` and `FetchRequestDetail.tsx` now derive status and format options from the OpenAPI spec via `useConfig()` instead of using hardcoded arrays.

Reviewed-on: #10
Co-authored-by: Vishesh 'ironeagle' Bangotra <aetoskia@gmail.com>
Co-committed-by: Vishesh 'ironeagle' Bangotra <aetoskia@gmail.com>

react-openapi/types/overrides.ts

@@ -1,13 +1,14 @@
-/**
- * This file contains application-specific overrides and configuration
- * for the generic Admin Panel.
- */
+export interface EnumOption {
+  key: string;
+  value: string;
+}
 
 export interface FieldOverride {
   displayField?: string | string[];
   display?: boolean;
   formatter?: (value: any) => string;
   filterType?: "autocomplete" | "multiselect" | "number-range" | "date-range";
+  enumLabels?: Record<string, string>;
 }
 
 export interface ResourceOverride {
@@ -18,4 +19,5 @@ export interface ResourceOverride {
     mode?: "server" | "client";
     fields?: string[];
   };
+  enumOption?: EnumOption;
 }