chore: fix remaining Antigravity Proxy refs, add systemd unit

- Rename CA org to ZeroGravity
- Fix lib.rs docstring
- Fix mitm-redirect.sh comment
- Fix README title

README.md

@@ -1,4 +1,4 @@
-# Antigravity Proxy
+# ZeroGravity
 
 OpenAI-compatible proxy that intercepts and relays requests to Google's Antigravity language server, impersonating the real Electron webview.
 

scripts/mitm-redirect.sh

@@ -58,7 +58,7 @@ install() {
     # This is needed for the proxy to spawn the LS binary.
     local REAL_USER="${SUDO_USER:-$(logname 2>/dev/null || whoami)}"
     cat > "$SUDOERS_FILE" <<EOF
-# Allow $REAL_USER to run commands as $LS_USER (for antigravity proxy)
+# Allow $REAL_USER to run commands as $LS_USER (for zerogravity)
 $REAL_USER ALL=($LS_USER) NOPASSWD: ALL
 # Allow $REAL_USER to kill $LS_USER's processes (for clean shutdown)
 $REAL_USER ALL=(root) NOPASSWD: /usr/bin/kill -TERM *, /usr/bin/kill -KILL *, /usr/bin/pkill -TERM -u $LS_USER *, /usr/bin/pkill -KILL -u $LS_USER *

src/lib.rs

@@ -1,3 +1,3 @@
-//! Antigravity proxy library — shared modules for main proxy and tools.
+//! ZeroGravity library — shared modules for main proxy and tools.
 
 pub mod snapshot;

src/mitm/ca.rs

@@ -115,7 +115,7 @@ impl MitmCa {
 
         let mut dn = DistinguishedName::new();
         dn.push(DnType::CommonName, "Antigravity MITM CA");
-        dn.push(DnType::OrganizationName, "Antigravity Proxy");
+        dn.push(DnType::OrganizationName, "ZeroGravity");
         params.distinguished_name = dn;
 
         params.is_ca = IsCa::Ca(BasicConstraints::Unconstrained);