Use reqwest 0.12 with rustls-tls and add timeouts

Also improve review prompt with line calculation instructions, switch
feedback to French, and enable reasoning for OpenRouter.

src/consts.rs

@@ -20,7 +20,17 @@ pub const REVIEW_PROMPT: &str = "
     \"{diff}\"
 
     Please review the code changes and provide feedback.
-    Return your feedback with only this json format, reviews must contain each review (filename field must contain the full path with extension) and comment msut contain a final summary:
+
+    IMPORTANT — How to compute the line number:
+    The diff is in unified format. Each hunk starts with a header like:
+    `@@ -old_start,old_count +new_start,new_count @@`
+    The `line` field must be the line number in the **new** version of the file.
+    To find it, start at `new_start`, then count every context line (no prefix)
+    and every added line (prefixed with `+`) — skip removed lines (prefixed with `-`).
+    The line number increments by 1 for each context or added line.
+
+    Return your feedback, in french, with only this json format, reviews must contain each review
+    (filename field must contain the full path with extension) and comment must contain a final summary:
 
     {
         \"reviews\": [