Revert "feat: HTTPS via self-signed dev certificate (auto-generated)"

This reverts commit d6f508f848.

run.py

@@ -1,65 +1,25 @@
-"""Entrypoint. Runs the Flask app over HTTPS (self-signed cert in dev).
-
-TLS is mandatory in this design: the passphrase and all plaintext stay
-in the browser, and the API only makes sense over an encrypted channel
-so browsers refuse to send crypto JS/code over an untrusted channel (
-mixed content / HSTS-chaining attacks).
-
-Two modes:
-  - certs/cert.pem + certs/key.pem present -> serve https://127.0.0.1:8443
-  - otherwise -> generate a self-signed certificate (only for local dev)
-    and start on https://127.0.0.1:8443
-
-If openssl is unavailable, falls back to plain HTTP on 5000 with a loud
-warning — dev convenience only, NOT suitable for production.
-"""
+"""Dev/Prod entry point. Runs the Flask app, over TLS when certs exist."""
 
 import os
 import ssl
-import subprocess
-import sys
 
 from backend.app import app
 from backend import storage
 
-CERT = os.path.join("certs", "cert.pem")
-KEY = os.path.join("certs", "key.pem")
-
-
-def _ensure_self_signed_cert():
-    if os.path.exists(CERT) and os.path.exists(KEY):
-        return
-    os.makedirs("certs", exist_ok=True)
-    subprocess.run(
-        [
-            "openssl", "req", "-x509", "-newkey", "rsa:2048",
-            "-keyout", KEY, "-out", CERT,
-            "-days", "365", "-nodes",
-            "-subj", "/CN=localhost",
-            "-addext", "subjectAltName=DNS:localhost,IP:127.0.0.1",
-        ],
-        check=True,
-        stdout=subprocess.DEVNULL,
-        stderr=subprocess.DEVNULL,
-    )
-    print("Self-signed dev certificate created in certs/.")
-
 
 def main():
     storage.init_db()
 
-    port = int(os.environ.get("PORT", "8443"))
-    host = os.environ.get("HOST", "127.0.0.1")
+    cert = os.path.join("certs", "cert.pem")
+    key = os.path.join("certs", "key.pem")
 
-    try:
-        _ensure_self_signed_cert()
+    if os.path.exists(cert) and os.path.exists(key):
         context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
-        context.load_cert_chain(CERT, KEY)
-        print(f"Serving on https://{host}:{port} (self-signed dev TLS).")
-        app.run(host=host, port=port, ssl_context=context)
-    except (FileNotFoundError, subprocess.CalledProcessError) as e:
-        print(f"WARNING: no TLS available ({e}); falling back to HTTP.", file=sys.stderr)
-        app.run(host=host, port=5000)
+        context.load_cert_chain(cert, key)
+        app.run(host="127.0.0.1", port=8443, ssl_context=context)
+    else:
+        print("WARNING: no certs/ found, running WITHOUT TLS (dev only!).")
+        app.run(host="127.0.0.1", port=5000)
 
 
 if __name__ == "__main__":