feat(loan-origination): add full backend persistence for the sanctioning pipeline

Adds a lightweight loan-origination-pipeline module (application, stage history,
approvals, FI checks and documents) with server-side validation per stage
transition, so every field, upload and decision on the Loan Origination screen
survives a page refresh instead of living only in the browser.

Also fixes two content-store bugs found while wiring document uploads through
the generic Fineract document store: the CSV mime/extension whitelist rejected
bank-statement uploads outright, and the post-upload mime consistency check
rejected any CSV whose byte-content sniffs as text/plain (which is all of them,
since CSV has no distinguishing magic bytes).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

fineract-document/src/main/java/org/apache/fineract/infrastructure/contentstore/policy/MimeContentPolicy.java

@@ -18,6 +18,7 @@
  */
 package org.apache.fineract.infrastructure.contentstore.policy;
 
+import java.util.Set;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.Strings;
@@ -31,6 +32,10 @@ import org.springframework.stereotype.Component;
 @Component
 public class MimeContentPolicy implements ContentPolicy {
 
+    // CSV has no content-level magic bytes, so byte-sniffing a delimited text file legitimately
+    // detects it as text/plain even though it was uploaded (and named) as text/csv.
+    private static final Set<String> INTERCHANGEABLE_TEXT_MIME_TYPES = Set.of("text/csv", "text/plain");
+
     private final ContentDetectorManager contentDetectorManager;
 
     @Override
@@ -39,7 +44,11 @@ public class MimeContentPolicy implements ContentPolicy {
             var result = contentDetectorManager
                     .detect(ContentDetectorContext.builder().inputStream(ctx.getInputStream()).inputStreamEnabled(true).build());
 
-            if (!Strings.CI.equals(result.getMimeType(), ctx.getMimeType())) {
+            boolean matches = Strings.CI.equals(result.getMimeType(), ctx.getMimeType())
+                    || (INTERCHANGEABLE_TEXT_MIME_TYPES.contains(result.getMimeType())
+                            && INTERCHANGEABLE_TEXT_MIME_TYPES.contains(ctx.getMimeType()));
+
+            if (!matches) {
                 throw new ContentPolicyException(String.format("Detected file type (%s), but mime type (%s) was provided. Mismatch!",
                         result.getMimeType(), ctx.getMimeType()));
             }