Refactor analysis file names

The versioning of analysis input and document files
(`analysis_input_v{N}.json`, `document_v{N}.md`) has been removed. All
analysis inputs will now use `analysis_input.json` and generated
documents will use `document.md`.

This simplifies file management, as there's no longer a need to track
and manage multiple versions of these files within a case directory. The
analysis worker will now overwrite the existing `document.md` if it
exists, ensuring that the latest analysis result is always present. The
`version` field has also been removed from `AnalyzeJob` and
`AnalysisInput`.

server/src/routes/bulk.rs

@@ -8,12 +8,12 @@ use time::format_description::well_known::Rfc3339;
 use time::OffsetDateTime;
 use tracing::{info, warn};
 
-use crate::analyze::{AnalyzeJob, AnalyzeSender};
+use crate::analyze::{AnalyzeJob, AnalyzeSender, ANALYSIS_INPUT_FILE, DOCUMENT_FILE};
 use crate::auth::AuthenticatedWebUser;
 use crate::config::Config;
 use crate::error::AppError;
 use crate::paths::{write_delete_marker, DeleteMarker};
-use crate::routes::case_actions::{build_analysis_input, find_latest_document, write_input_create_new};
+use crate::routes::case_actions::{build_analysis_input, write_input_create_new};
 use crate::routes::user_web::locate_case;
 
 #[derive(Debug, Deserialize)]
@@ -72,11 +72,19 @@ async fn bulk_analyze(
             skipped += 1;
             continue;
         };
-        let version = find_latest_document(&case_dir)
-            .await
-            .map(|(v, _)| v + 1)
-            .unwrap_or(1);
-        let input = match build_analysis_input(&case_dir, version).await {
+        // Same order as the single-case handler: drop old document first so
+        // the UI doesn't keep showing "ausgewertet" during re-analysis.
+        let document_path = case_dir.join(DOCUMENT_FILE);
+        match tokio::fs::remove_file(&document_path).await {
+            Ok(_) => {}
+            Err(e) if e.kind() == std::io::ErrorKind::NotFound => {}
+            Err(e) => {
+                warn!(slug = %slug, case_id = %case_id, error = %e, "bulk-analyze: remove old document failed");
+                skipped += 1;
+                continue;
+            }
+        }
+        let input = match build_analysis_input(&case_dir).await {
             Ok(i) => i,
             Err(_) => {
                 warn!(slug = %slug, case_id = %case_id, "bulk-analyze: build_analysis_input failed");
@@ -84,7 +92,7 @@ async fn bulk_analyze(
                 continue;
             }
         };
-        let input_path = case_dir.join(format!("analysis_input_v{version}.json"));
+        let input_path = case_dir.join(ANALYSIS_INPUT_FILE);
         if write_input_create_new(&input_path, &input).await.is_err() {
             warn!(slug = %slug, case_id = %case_id, "bulk-analyze: write input failed");
             skipped += 1;
@@ -93,7 +101,6 @@ async fn bulk_analyze(
         if analyze_tx
             .send(AnalyzeJob {
                 case_dir: case_dir.clone(),
-                version,
             })
             .is_err()
         {