Fix all Valgrind errors: uninitialized values and memory leak

This commit resolves all Valgrind errors reported in the test run:

1. Fixed uninitialized 'removed' array in tcp_translate_events (tcp.c:179)
   - Added memset to initialize the array to zero before use

2. Fixed uninitialized RequestQueue in client initialization (client.c)
   - Added initialization of metadata_server.reqs and chunk_servers[].reqs
   - Added forward declaration of request_queue_init function

3. Fixed uninitialized descriptor generation field (system.c:324)
   - Initialize generation to 0 when creating process descriptors
   - Prevents uninitialized value errors in handle_to_desc

4. Fixed 34-byte memory leak in tcp_context_free (tcp.c:91-103)
   - Added cleanup of connection byte queues when freeing TCP context
   - Frees both input and output ByteQueues for all connections

All Valgrind errors have been resolved:
- ERROR SUMMARY: 0 errors from 0 contexts
- All heap blocks freed - no leaks possible

src/client.c

@@ -91,6 +91,9 @@ struct TinyDFS {
     Operation operations[MAX_OPERATIONS];
 };
 
+// Forward declaration
+static void request_queue_init(RequestQueue *reqs);
+
 TinyDFS *tinydfs_init(char *addr, uint16_t port)
 {
     TinyDFS *tdfs = sys_malloc(sizeof(TinyDFS));
@@ -118,6 +121,18 @@ TinyDFS *tinydfs_init(char *addr, uint16_t port)
     for (int i = 0; i < MAX_OPERATIONS; i++)
         tdfs->operations[i].type = OPERATION_TYPE_FREE;
 
+    // Initialize metadata server
+    tdfs->metadata_server.used = true;
+    tdfs->metadata_server.addr = addr2;
+    request_queue_init(&tdfs->metadata_server.reqs);
+
+    // Initialize chunk servers
+    tdfs->num_chunk_servers = 0;
+    for (int i = 0; i < MAX_CHUNK_SERVERS; i++) {
+        tdfs->chunk_servers[i].used = false;
+        request_queue_init(&tdfs->chunk_servers[i].reqs);
+    }
+
     return tdfs;
 }