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>

src/FetchRequests.tsx

@@ -129,7 +129,7 @@ export default function FetchRequests() {
 
   const config = useConfig();
   const fetchRes = config?.resources.find((r: any) => r.name === "fetch-requests");
-  const formatOptions: string[] = (fetchRes?.fields?.source?.schema?.format?.options as string[]) ?? ["axis", "icici"];
+  const formatOptions: string[] = fetchRes?.fields?.source?.schema?.format?.options as string[] ?? [];
 
   const createMutation = useCreateFetchRequest();
   const updateMutation = useUpdateFetchRequest();
@@ -345,7 +345,7 @@ export default function FetchRequests() {
               input={<OutlinedInput label="Status" />}
               renderValue={(selected) => (selected as string[]).join(", ")}
             >
-              {["pending", "processing", "paused", "raw_expenses_done", "enriched_done", "completed", "failed"].map((s) => (
+              {(config?.enums?.FetchRequestStatus ?? []).map((s: string) => (
                 <MenuItem key={s} value={s}>{s.replace(/_/g, " ")}</MenuItem>
               ))}
             </Select>